I have become quite enamored of the German States coinage of the 17th-19th C., there are some appealing designs and very low prices with the minors. This period was full of great men, famous battles, and just very interesting history. All of the good images are by RCToners (on my links page), all of the poor quality images are by me.
As for costs, most of these are priced at $25-500 in the market, however some of them do not show up in the marketplace more than once or twice a year so you have to be ready to jump on them. The 1855 Hamburg proof Skilling is a good example, this was priced under $200 when I purchased it, but it is the only one I have seen for sale, and was originally minted in a very small quantity.
German States, 1698 Prussia (Duchy) 18 Groschen, NGC 63. Frederick III as Elector of Brandenburg and Duke of Prussia. After supporting Leupold I , Archduke of Austria and Holy Roman Emperor, in the War of the Spanish Succession, Frederick convinced the Emperor to elevate Prussia to a Kingdom and his staus to "King in Prussia" as Frederick I.
German States, 1708 HB Brunswick Lunburg 4 Marian Groschen, NGC62.
German States, 1711 Frankfurt 1 1/2 Ducats (SIlver), NGC 62. Commemorating the Accension and Election of Karl VI as Holy Roman Emperor, King of Bohemia etc.
German States, 1735 Brandenburg 1/12 Taler, NGC 62. Commemorating the death of George Friedrich Karl, Margrave of Brandenburg-Bayreuth. This in an interesting design on the obverse with a dove ascending to the sun.
German States, 1745 Frankfurt 3/4 Ducat, NGC 63. Commemorating the coronation of Francis the 1st as Margrave of Frankfurt. Normally the ducats and fractionals were minted in gold, however many of the commemorative pieces were also minted in silver and, rarely, copper.
German States, 1757 B Brandenburg-Bayreuth 1/6 Taler, NGC 64. None listed in the population reports.
German States, 1782 Regensburg 1/2 Taler, NGC 61. With a slight flan crack which really does not show up much in hand. A really lovely city view on the reverse. Not listed in the population reports.
German States, 1783 Bavaria 20 Kr., PCGS 62. This example has adjustment marks (filed to get the weight correct prior to striking), and the reverse die was nearly finished when this coin was struck. None the less a decent example, I particularly like the Madonna reverse used on the Bavarian pieces.
German States, 1792 Frankfurt 1 1/4 Ducat Silver), NGC 63. Ex Willy Fuchs collection this commemorates the coronation of Franz II as Holy Roman Emperor. While the obverse design is very spare I really like it.
German States, 1825 S Saxony 1 Pfennig, PF65BR. A rare example of an early proof with attractive blue and violet toning.
German States, (1839) Frankfurt 1 Kruezer, NGC 66. In spite of the high grade these were apparantly saved by many, population 7/7. The reverse on these is very nice, with a view of the city, I chose this particular coin because there is a very strong clashed die with most of the obverse eagle showing on the reverse.
German States, 1840 Baden 6 Kreuzer NGC 67, population 1/0. I particularly like the Shield device on the obverse of this coin. A reasonably common coin in lower grades it becomes fairly scarce in grades of 65 and above. This one has much better luster than my poor photo shows.
German States, 1853 Wurttemburg Kreuzer, NGC 67, population 1/0. ANother fairly common minor coin in an uncommon state of preservation, mostly brilliant.
German States, 1855 A Mecklenburg-Strelitz 1/48 Taler (Schilling), NGC PF64. A very scarce to rare proof minor, attractively toned, population 1/0.
German States, 1855 A Hamburg 1 Sechsling (Shilling), NGC PF65 population 1/0. A rare issue in proof, this is the only one graded by NGC.
Berman States, 1855 Bavaria 2 Gulden MGC MS63, commemorating the restoration of the Madonna Column. 
German States, 1858 A Schaumburg-Lippe 4 Pfenning, NGC PF64 Red. With a estimated mintage of only 50-100 they are very scarce to rare in proof.
German States, 1858 A Schaumburg-Lippe 1 Silber Groschen. NGC PF66, another rare proof minor, the only one currently graded. This coin has particularly attractive toning.
German States, 1861 Frankfurt 2 Thaler, thought to show Baron Rothschilds mistress. In an NGC AU58 holder, no wear on the devices really, just some minor rub marks in the field keep this from a MS grade.
German States, 1861 A Mecklenburg-Schwerin 1/48th Taler, PCGS PF64. Another of the rare German States proof minors. This one with exquisite toning.
German States, 1861 A Prussia Silber Groschen, NGC PF 64, population 1/0. Another very scarce to rare issue of the German States proof minors . This one essentially bright white with very faint tooning starting in the fields, strong mirrors and light cameo contrast on the devices, although not enough to earn the cameo designation.
German States, 1862 A Arnhalt Bamberg Silber Groschen, NGC PF 65 UCAM, population 1/0, the only one graded. This is another interesting 19th C. proof, estimated mintage of 50-100 although not listed in the Standard Catalog of World Coins. Probably an R6 coin with perhaps a dozen or two survivors.
1862 A Prussia 2 1/2 Silber Groschen, NGC 67. The large scratch on the reverse is on the slab, not the coin.
German States, 1862 Nassau Kreuzer, PCGS 65RB, population 1/0 at PGCS and 0/0 at NGC. I like the shield design which is why I purchased this one.
German States, 1865 B Hannover 1 Groschen, NGC 66 population 1/0. Another one I like just for the design with the rearing horse. This one is very crusty with brown and gold toning.
German States, 1865 B Hannover 1 Thaler. Commemorating the 50th anniversary of Union with Frisia, NGC PF65 Cameo. A very rare coin in proof.
German States, 1869 Saxe-Gotha-Coburg 1/6 Taler, NGC PF64 with light original toning. Population 1/0, a very scarce to rare coin in proof. This was issued to commemorate the 25th year of the Reign of Duke Ernst II.
German States, 1869 C Prussia 3 Pfennig (120th Taler), NGC PF64 RB, population 1/1. Another of the very scarce to rare proof minors.
German States, 1870 A Prussia 1 Silber Groschen, NGC 68, population 1/0. Brilliant and the highest graded in the series so far.
German States, 1871 Saxony Taler, NGC 66. The next group are all commememoratives of the victory of Prussia and its German States allies in the 1870 war against France. This war led to the unification of Germany under King Wilhelm of Prussia, and the end of the Second Empire in France.
German States, 1871 Wurtemburg Taler, NGC64. ommemorates victory in the Franco-Prussian war. Muted gold and grey toning.
German States, 1871 Prussia Taler, NGC 62. Commemorating victory in the Franco-Prussian war. A nice crusty look, the colors are muted which I like, others may prefer really bright colors.
Geman States, 1871 Bremen Victory Taler, NGC 65.
German States, 1871 Bavaria Victory Taler, PCGS 64. A really superb coin for a 64, a few light hairlines on the obverse but no major marks at all.
German States, 1871 Bavaria Madonna Taler. PCGS 66 and the finest graded, a really superb reverse design on these. A common coin in mid grade but much tougher than it should be in 65 and above.
German States, 1888 A Prussia 5 Marks of Friedrich III, NGC 65.
