Funny how all of the builds thus far consist of all mid BAB classes, with the exception of my wizard/magus (which ends up being mid BAB) I suppose Mid BAB classes tend to have the most interesting class features... Anyway, time to break the pattern!
Magus 1-20
Fighter 1-6/Duelist 1-10/Fighter 7-10A truly deadly Magus. So many cool things about this build. Obviously its full BAB, which is a nice improvement. Duelist stacks perfectly with Magus; weapon in one hand, nothing in the other. Add Int to AC; again perfect with a Magus. Weapon Finesse and Dervish Dance is written all over this build. All in all, a deadly combatant I'd love to have on my front lines.
How Fighter Training stacks with levels of fighter, I'm not exactly sure. I would rule that it stacks; however your fighter level cannot exceed your character level. Given that, you should be able to qualify for most all of the fighter feats, eventually.
Currently playing this in a crazy game (two of the players have D20 modern classes and were pulled in to the world while on their way to a game so they have their books and meta game in game). Seems to work well but when everything you fight is a gestalted half-dragon monk/whatever only flatfooted touch and crits seem to hit anyway.