i'm not sure whether you've made a map pool for ctf or not but i'd like to suggest one up for debate. i've selected the following maps based on how good their gameplay is and how well they are designed, not on any balance issues.
ac_elevation
ac_gothic(debatable, i think it has poor gameplay, but because teams pick it so much it would win any vote)
ac_shine
ac_sunset
ac_arabian(only if all the users use windows/linux)
ac_werk
ac_outpost
ac_desert3
ac_mines
ac_ingress(debatable, as the gameplay is terrible in my opinion.)
ac_aqueous(some people will probably bring up the balance issues, but other than that it is a well designed map.)
ac_elevation
ac_gothic(debatable, i think it has poor gameplay, but because teams pick it so much it would win any vote)
ac_shine
ac_sunset
ac_arabian(only if all the users use windows/linux)
ac_werk
ac_outpost
ac_desert3
ac_mines
ac_ingress(debatable, as the gameplay is terrible in my opinion.)
ac_aqueous(some people will probably bring up the balance issues, but other than that it is a well designed map.)