I'm still not quite sure, they all have their pros and cons. In a couple of weeks I'll have the money to make my purchase, so hopefully I'll decide by then. I'm pretty sure it'll be the IPV Mini 2, even though it is taller than I'd like it to be, simply because the Vapor Shark might be a bit too expensive, and the lack of spring-loaded pin on the Kanger rules it out for me. Ideally, I think I'd prefer the VS, but I can't really brush off a $60-80 difference at this point in time, unfortunately. Especially for 30 watts less than the IPV.