What year and mint mark of a silver quarter is most wanted?

There are a number of particularly rare and collectible U.S. quarters. Dates with fewer than one million include 1932 D and S, 1927 D and S, 1915 S, 1914 S, 1913 P, 1912 S, 1911 D and S, 1909 O, 1908 S, 1899 S, 1897 S, 1896 S, and 1892 S. Dates with fewer than 100,000 are the 1916 Standing Liberty, 1913 S, and 1901 S. Note that this only covers Washtington, Standing Liberty, and Barber quarters, not including proofs. Many dates of earlier quarters were minted in small numbers, some at under 10,000.