I went through this when I was ready to leave the eGo style.. it was so frustrating with all the options and did I want a tube, did I want a box.. did I want plug in rechargeable style, or rechargeable batteries and a separate charging unit.. and no stores meant I was winging it!
lots of videos, lots of reading threads and reviews.. it was tiresome and frustrating!
personally, I went with the MVP and have been real happy with it, so much so I got the 2.b when I was able. vv/vw, resistance checker, priced right for me, lasts long between chargers, and can handle anything I put on top of it- but I don't get much fancier than a Pyrex tank with 1.7 single coil carto. and I actually prefer the box style over tubes.. hardly ever use the eGo style anymore, and couldn't imagine something thicker and rounder to tote around.
like someone else said- you'll get a zillion different answers to this question, but you'll only know what's right for you when you try it. hopefully you have B&Ms nearby!