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Mine is CTF-UTDM-Eagles3, which I edited from the original (made a lot of edits of it actually).
The ground base has 2 titans, the base carved into the mountain has 3 warlords... and the map has 1 of the most powerful nukes I've ever seen outside of NW3.
CTF-Gauntlet (how original I know), because I love non symetrical maps and this one has the advantage of playing normally, not like oddball maps like HallOfGiants or Face.
I have a few. Official maps-wise, it's gotta be Cybrosis ][, Facing Worlds (of course!), Hall of Giants, Hydro Bases, Lava Giant, Noxion Base, and Sepulchre from the PS2 version; custom map-wise, it's Hyperw00t.