[berzerkmonkey]

If you're looking for realistic fonts, I'd recommend the following:

1600-1700's - Caslon Antique, Casablanca Antique, Chanticleer Roman NF
1800-1900's - Edwardian Script, Monotype Corsiva, Copperplate Gothic, Engraver's MT

Another good bet would be to look around at real tombstone photos and find a font you like. Then, go to a free font site and look around. Also, you could try a font identifier, like WhatTheFont, and try to figure out a close approximation of something you like.

If you're looking for creepy fonts though, just go to a free font site and search for horror fonts. You'll find tons of stuff.