We should probably clarify that technically just about everything listed above is a clearomizer, not a tank. I've personally been using the clearo-tank mini vivi nova on my ego twist and I like it a lot. So that would be my recomendation to Michelle for a 510 connection, if you want a tank-atomizer all in one (commonly called a clearomizer).
For 808 connections I don't know a lot, but I did use them for a little while prior to going to the ego twist. First, I'd recommend having an X2 type battery like the volt x2, infinity, etc. The Phoenix listed above looks pretty good, and at o2vapor (and other places too, I just know that I got some from them with my infinity batt's) you can find some clearmizer's that are similar to the vision stardust.
Also, just for clarification to the OP, to my knowledge there is no 808 style batt made by Ego. There are ones that look like ego though, and I just referred to those as X2 808 batt's, which is what I've been seeing them called around here.