I've been trying to play every new map at least once or twice, and then more if I like it.
But if I'm looking for a good traditional game, I always go back to my old favorites: Africa, Asia, Great Lakes, Indochina, Scotland, and USA, to name a few.
If I'm looking for something with some different strategy, then there's AoR 1 and 2, Dday and Feudal for me to play with.
There are others I like also, but those are the ones I'm most interested in right now.
So I guess I fall into the 6-15 category.