Crocky, i'm also shopping for 18500/18490 batteries. I don't feel any of the offerings are "ideal", no IMR high discharge batteries in that size. The ultrafire batteries have so many people talking down on them, IDK if i want to be the one to "prove them wrong". I'm using a efest 18350 with a kick and only get about 3 hours of heavy vaping out of it. I'll be making due with what i got until i find safe chemistry batts that i can trust.
On a positive note, I got 6 18650 IMR's for the price of 2 from an stateside vendor.