I understand about wanting huge amounts of vapor. That's what I want, too.
I've gone through a few different models and in my opinion the 510 atty gives the best vapor all around. The problem with the 510 kits is that the battery life is horrible. I now own the eGo and it's got fantastic vapor and fantastic battery life. So that has to be my recommendation for the 510 now.
I also own the VP/PT. It's a 5 volt device and even though I am a huge fan of the 510 atty, once I tried the low bridge 801 (or the 302 which is basically the same thing, but maybe a tad bit better) I liked it better. But I only like it on the VP/PT. With the 302/801 low bridge, you get huge, massive, clouds of vapor. It's vapor heaven. Really. I don't use my VP/PT that much because of the amount of juice I go through with it, but I do use it daily. A little bit in the mornings and a little bit in the evenings. Oh, and the best vapor comes when the VP/PT is plugged into an outlet, not plugged into the computer.
As far as juice goes, the more VG you have, the better the vapor production. Straight VG is very thick, but doable. I usually use about 50/50 VG&PG when I mix my own. Sometimes a little more VG than PG.
Of course these are just my opinions. I'm sure you'll get some more before too long.