Gestalt Help

[Tavar]

I'm making a Dual wielding Swashbuckler//Scout/Uncanny Trickster for a game, using the Riposte and dungeon specialist scout variants. Now, I can only have 4 classes total, so, any suggestions on another class? I'd prefer to keep have it on the Swashbuckler side, and would like to keep Full BaB, though dropping to 3/4 is okay. The only other restrictions are no Tome of Battle and no Magic of Incarnum, so any other books should be good. Oh, and the class should be usable by Evil Characters.

[Boci]

Fighters can usually go by in gestalt, since you get class features from elsewere. You could use the fighter variant from UA that grants sneak attack instead of bonus feats.