why choose one? I'm currently trying out something similar with swashbuckler, but I'm not choosing just one. 3swash/3factotum/2rogue/1ambush fighter ACF/1-2sworsage tossed on for good measure, and in no particular order. grab that calm emotions thing (that one's new to me) and adding dex to damage vs flatfooted foes (from the ambush fighter, its in drow of the underdark.) not real elegant, and only a bit better than caster bab, but with some pumped int and dex, weapon finesse/cunning insight/snowflake wardance (if you have decent cha) means you dont really need a high attack bonus. add a lvl of master of masks for a cheap +2d6 sneak attack die and you're sittin pretty on a pile of corpses (something like 7d6 sneak attack die without any magic items, though you should snag a rogue's vest, deadly precision weapon, and a mantle of the predator for another handful of dice to roll). slap on 5 lvls invisible blade and take off your armor, you can face down enemies without needing to flank.

not the cheesiest or most OP, but its got all the things I like in it