i'm kind of tired of big bulky units. Even my infinity is too cumbersome at this point. Same with egos. I'm getting ready to pay up for a nice auto battery and some lowish resistance bottom coil cartos. The cigarette is cigarette-sized for a reason, you know.
The general rule of thumb, however is the more it looks like an analog, the worse it performs. If you want a small, analog style ecig, don't put anything LR on it...unless you want to replace the battery.