http://www.fpsbanana.com/maps/60768 - gg_treehugger

This is another simpsons map technically (you really can't tell its simpsons besides the pictures on the walls) it has some nice climbing spots and is a decent sized map

http://www.fpsbanana.com/maps/62008 gg_bkh_assault_runner
This is a big map but open enough that when 2 or 3 ppl are left the round won't last forever. I actually got to play with some ppl in another server on this map and everyone seemed to enjoy it

http://www.fpsbanana.com/maps/61222 gg_bkh_majestic_v1

This map was really fun. Two towers on each side (the top of the towers have cannons that shoot barrels when the triggers are pressed) a few teleport areas which are kinda fun, and and its big enough for a full server but not too big for a half dozen ppl