Replace GnoffBar with IceHUD, you get both a HUD and an energy ticker in one neat package. Find it over at
http://www.wowace.com/files
Chronometer is great at timeing things like CheapShot, Kicks, etc.
Anatagonist is another great AddOn for rogues. Anatagonist lets you see a cast bar for enemy spells allowing you to time your Kicks/Gouges just right.
Autobar(Toadkiller) is a great item to have to monitor things like Thistle Tea, Flash powder etc.
oAppilication makes applying Poisons and Stones as easy a right click on the item.
All but Autobar can found at
http://www.wowace.com/files Autobar can be found there too, but grab it off of Curse Gaming as the current devloper/maintainer (Toadkiller) updates there.