I know how that goes.. I went from a pen, to GLV Mechanical, and now I have a ProVari and an eVic.. To be honest and to save you some money, find a VV mod.
The eVic is pretty nice, I just got it in a CoOp about 3 weeks ago, and I love it. It's prety light, and the screen is high quality. However, the menu's are a pain to navigate on the device itself. You can connect/charge it via Mini USB. It comes with some software that you can change your settings with, much easier this way. It's a Chinese made device, so the Engish in the Software is pretty terrible, but not unreadable. Also, it's compatible with eGo and 510 connectors.
The ProVari is great too. It's American made (I'm pretty sure, anyways) and can take a pretty solid beating.. I took mine to Afghanistan and dropped it out of trucks in piles of dust, and had no issues. Doesn't have as many bells and whistles as the eVic, but it's the go to device for many vapers on this forum.
Do some research, and find a good VV mod for you, those two are my favorites, but there are many out there. Good luck!