Good move.
My advice would have been either the Riva 510 or 901. (If you were set on the Kr808d, then the 901). I just finalized my system after two months of trial and error: Riva 520 and Joye 510 manual. I started with the Greencig g300, Kr808d and cartomizers. I decided to go with atty's and carts because the carts are way easier to refill, and I find atty's to have way more consistent hits than carto's (when cartomizers are hitting, they are great. But they were so inconsistent from hit to hit.)
What I really love about the Riva (or eGo) and Joye 510 combo is the convenience. The Riva and about four filled carts (plug mod carts) is all I really need for the day. But you have to remember that in vaping, you always need backups just in case. So, I also always have my fully assembled and charged Joye 510 with me as well. Because the parts are interchangeable, they act as backups to each other: I've always got two batteries, two atty's and two carts with me (I also have a little case that holds about 9 extra carts). An added bonus is that the Joye 510 as a backup is nice and small and is great for those situations where you want something that looks like an analog.
I don't think you will regret the eGo no matter what. The only thing that can disappoint you about it would be the form factor: It doesn't look or feel like an analog cigarette. To a noob, that might be something they don't like. But even if that turns out to be the case, its performance will be so good that it will easily keep you satisfied until you can find the form factor that fits you. And even if later you do find something you like better, I'll bet the Riva stays in your active arsenal-- unlike other possible first choices that end up in a drawer.
That's why I have joined so many others on this forum who always advocate the eGo/Riva as a first ecig: it's performance won't fail you, even if you find you don't like the form factor.
(Be careful of that mega atty: I can't handle them, I get dizzy after three hits of my 24mg juice. I'm gonna stick with the regular 510 atty!)