Theo has a link to Aldriana's spreadsheet, although I haven't used that one in particular yet.
http://www.rogue.raidcal.com
Enable macros and import your toon. It's pretty easy. You can turn certain buffs on/off depending on your normal melee group, as well as change out your gear or spec as necessary if the armory hasn't updated yet.
Edit - Added the url.
Edited, Jul 29th 2008 1:39pm by Salwrathis