I use this http://metabattle.com/wiki/Build:Mesmer_-_PU_Condi_Roamer
and have a ton of fun in HoT pve.
Never die, full Dire condi. You can use staff to aoe tag and also have chaos storm. If you dont like torch, just run a pistol off hand instead. I personally prefer the torch due to the aoe phantasm and extra stealth.
Also works great in WvW.
Enjoy