I wouldn't go monk for that personally, not exclusively. The many rogue feats in Complete Scoundrel (I think they call them ambush feats) look promising. Something I like in particular, you may be able to use or twist some of the mechanics from Pathfinder's Butcher prestige class.
Basically, you look at others' discernable anatomy as pieces of meat and are more efficient in your handling of weapons regarding them. But again, roguey in nature. I'd say this is about as close as I've been able to project a character, I was once going to play a dwarf dual-wielding fighter rogue with it. It looks fun to say the least.
Dazing Slice (Ex)
A butcher knows everything about the way a body works, including where the nerves are. Beginning at 7th level, whenever a butcher successfully severs a limb, his target is dazed for 1 round (Will save DC 10 + ½ butcher’s class level + butcher’s Int modifier to resist).
Stunning Sever (Ex)
The nerve damage a butcher causes freezes his target in place. Beginning at 10th level, whenever a butcher successfully severs a limb, his target is stunned for 1 round.