For a new buyer, take a look at Cignot.com They don't have a complete kit for what I'm about to suggest, but everything there is genuine product - no fakes or clones.
You have been stuck at a fixed voltage battery with your 808 setup. The next logical choice would be a variable voltage (VV) battery. And that would be the eGo Twist. VV allows you to tweak your experience and adjust to differences in cartos, clearos and liquids.
You would, of course, need an eGo charger to go with.
If you are interested in clearos, any bottom coil in the Kanger line will do nicely. Across the board if they are BCC the experience won't be all that much different between a Kanger T3s, Kanger Evod, and a Kanger ProTank. If you like certain flavors that are known to crack plastic devices then you want to head straight for a glass ProTank though.
Pick up some extra replacement coils (heads) for whatever clearo you choose.
That would do it.
If your existing 808 is working for you - it's keeping you away from smoking - you could start with 1 Twist battery, 1 eGo charger, and whatever you want in clearos. Use both your existing 808 setup, the eGo Twist, and move on from there.