I have the C - because I have zero interest in using cartomizers. I'd recommend picking up some LR atties as well, but they seem to be sold out right now (I was going to get some more this morning).
The only thing that I've purchased (besides juices) in addition to my Ego-C are a couple drip tips, a couple atomizers, some LR atties and some extra tanks. And I think I've probably financed Mom and Pop's Vapor Shop kids' college (if they have any kids, not sure).
Buy samples of juices from different vendors you're interested in, then you can buy larger sizes of the ones you really like. I've purchased from 5 different juice vendors, and M&P is where I've landed currently as my favorite juice provider.
I love my Ego-C, and as a beginner, it's been perfect for me. Low maintenance, full flavors (with the LR atty), I can fill a tank and go, I don't have to fill carto's and worry if I've filled them enough or let them sit for 30 minutes before I use them, and I don't have to worry if I'm inhaling any burned carto filler.