Tony Vargas
Legend
Viscous is nice because it's relatively inexpensive and has the largest crit die (only vorpal rivals it). Duelist's does a little more crit damage than a regular weapon when you have combat advantage, which, as a rogue, you should be managing to get most of the time - when you don't, it's daily briefly grants you CA.
A parrying dagger for your off hand isn't a bad idea, either.
Anything that lets you get in more attacks/round is desireable if you have a very high crit potential - so close-blast effects like Blinding Barage and it's higher level cousins, close-burst weapon attacks, and two-weapon attacks poached from the Ranger class are all attractive options. Even extra melee basic attacks (like OAs) are worth taking - they might not hit well - but probably still well enough to crit on an 18.
A parrying dagger for your off hand isn't a bad idea, either.
Anything that lets you get in more attacks/round is desireable if you have a very high crit potential - so close-blast effects like Blinding Barage and it's higher level cousins, close-burst weapon attacks, and two-weapon attacks poached from the Ranger class are all attractive options. Even extra melee basic attacks (like OAs) are worth taking - they might not hit well - but probably still well enough to crit on an 18.