Lockout, terminal, headlong, ascension, ivory tower, the pit. Hell, even foundation. Damn, just throw in all Halo 2 maps!!!! I forgot the name, but Halo 2 had a great snow one that came out in one of the DLC packages. It was huge. What was it?
I'm a huge 1 flag CTF fan, so any map that it worked well on excites me so much.
If I had to pick just one, I'd say headlong. CTF and assault were just too perfect on that map.