I love my monkcher Adelaise, she's very capable and has also done similar things to your first respondent. However, I find my unarmed rogue Newtou-1 to be my most fun, laid back character; with an archer I'm constantly worried about my positioning to maximise my damage via IPS and so forth.
With Newtou-1 I just wander from enemy to enemy hitting stunning fist and watching their health be obliterated by the 1.5x on the sneak attack damage provided by 18 rogue levels and when I'm in GMoF I supplement that with doing big falcon punches knocking everyone over, maggot farts that blind everyone and the big EiN's that wipe entire rooms of EE mobs ... he's definitely the most fun to play of my toons and the most laid back, no one expects much of a rogue as long as you get the traps.
In your situation I'd check out what Nick was planning; I believe it was human 12 monk/7 rogue/1 fighter. With this split you can still fit vorpal fists via vorpal strikes which I think is the crucial part of the build (I get it via Assassin III but I can see the incentive of this option) and you can fit Overwhelming Critical as well assuming that you have a +4 strength and/or wisdom tome. Round off with the sneak and haste boost from 7 rogue, sense weakness and you'll have a trash destroying machine.
Curiously enough on Newtou's 18 rogue/2 monk split I've still done my fair share of tanking and such things in some old epics and more recently in EH DA the other day, was a bit disappointed that I was able to hold aggro but whatever, just get on and do it.
I find New's build so capable that I've left him somewhat neglected as a Heroic build and haven't bothered to grind out any destinies as he performs totally fine without all the destiny points along though I'm slowly chipping away at neighbouring destinies in the usual course of play.