What I've tried so far:
Blu (yeah, yeah, the most common nubie mistake)
eGo Mega Type A - much better but cold and tasteless
eGo
tank - great feeding system but still cold and tasteless
TW LR eGo
tank - better but still not tasty
Cisco's Laser Pointer
mod - pretty easy and works well.
At the moment I'm dripping using LR 306, LR 510 and LR 901's.
I have a GLV2 on order (can't wait!)