I tried to not do 2 that were the same gamemode
ctf_converge - Interesting ctf mode that is custom but easy to pick up, not a huge map so easy to learn and looks great.
pl_clifftop - Pretty theme, has a dynamic element, nice use of vertical space, pretty well balanced
plr_hysteria - People know and like plr_panic and it's a nicer updated version of the most interesting part of the map. Doesn't stalemate like other plr maps.
cp_gothic_b1 (the non event version) - the best steel type map other than steel. Interesting look, People like Mann Manor theme and pulls it off great. Not too hard to pick up layout for this gamemode.
cp_zinkenite - Beautiful A/D map, interesting last stage, can't really go wrong with it.