Here is a list of some I have downloaded over the last year, each for a hugely different maps, and most of them rejected.
I end up using only about 1 in every ten, since its impossible to know exactly what font will work, and what won't. what looks nice on the font site isn't necessarily ideal for a map.
There is one here that came from a site that DanielHasenbos recommended when I asked him what font he was using in one of his maps:
http://iginomarini.com/fell/the-revival-fonts/
I like the classical flavour of that one, but I wouldn't use it in a map like Scribble Rock, for instance. I used Tolkien in that one (another font that's rapidly becoming rather over-used).
Thinking about it now - that's probably the best way to develop your own collection - by looking around and asking other cartographers what that font is in their map