Oh, I was under the impression that the 510's were favored and 306's were obselete(sp?...learning here

If I can do my order with iVape, I plan to throw in a couple of their's at...I wanna say $5.45 a piece. Should I add a LR one as well? I plan to grab a nice but cheap steel drip tip- around $3.50. Which brings up the question: do I
need a drip shield? I'm already dropping a big wad of cash, so I might want to keep my orders as they are. On the other hand, since I'm dropping a lot of cash, a little more may not be a big deal. Neither 101Vape or iVape seem to have drip shields- if I can trust their search functions, that is, and I don't want to add another order right now...well, maybe an order from a good juice vender.
Another thing, somebody said i can use my iPod's AC to usb adapter for my (soon to be-I think) MVP2 and VV3's. Curious if this can be verified? Katya sent me a link for the genuine iTaste adapter, but, again I don't want to do more than 2 hardware orders right now. Yeah, I guess I'll look up the specs on that again and try to find a match. Is it a case of: if you have a lower than spec charger it may, worst case, not really work, but if it's higher power than spec it might do serious damage? In a nutshell: if I buy a generic Wall socket to usb adapter that claims to be perfect for charging ego's, would I be playing with fire by plugging an iTaste usb cord into it? I have been looking for the answers to some of these questions, but with some issues, it's hard to get much intel....