Something to be said for buying the best out of the gate, but everyone has a different idea of what the best is. You may, for example, eventually want a bottom-feeder or something of that nature. Starting out with an Ego is a solid way to start. Even if you eventually go for one of the mods, you'll always have one of these as a backup. And I find that the smaller ego, with a cartomizer, fits in my pocket really nice. It's a 510 system, so you cartos and such that you buy for it can be used on that Provari, or whatever else you use.
Click on the 20% off, and buy a kit from here...
Electronic Cigarette - Starter Kits - Riva 510
Or somewhere else on the net. You cant buy bigger batts, tanks, and such later.