Zamm... I posted this same message in another thread a few days ago, but I think it should be re-stated....
If you want the best mod out there (IMO) check out...
THAG BUILT: You think you can break it?
You can run it 3.7V (for 3-4 days) or use two 3V batts for 6V vaping.
If you're worried about size look at the little chuck. (1-2day batt life)
If you want to read some reviews (all good from what I've seen) check out ECF (e-cigarette-forum.com) and search for Chuck. It's the "how to spend a saturday" thread. This guy is great. He will customize your chuck however you want it. Send him the graphics you want and he'll put 'em on and clear-coat over. To me, it's more than just a mod, it's a one-of-a-kind piece of art.
And it's only $75 plus $5 shipping. He builds each one to order so it may take 1-2 weeks to get but well worth it.
EDIT: Here's the link to the thread...
e-cigarette-forum.com • The place for electronic cigarette reviews, news and chat
It's a very long thread but you can see the progression of the Chuck from it's conception. If you want to see some of the latest works, go to the end and work your way back.
BTW: the pics of the illusion colors don't do them justice. In person they are absolutely gorgeous.