If you like the MVP, innokin also makes the iTaste VV (V3) which has a built in resistance checker. It's what I use, and I really enjoy mine. fasttech has the kit version for $40 or you can get the express version domestically for about the same price (maybe cheaper if you shop around).
Probably if I had it to do over again that's what I would have gotten. At least I think so.....I have a whole lot of love for my MVP, but I'd love to have a built in resistance check. Alas, except for a handful more delivery methods (evods, etc), I'm going to have to wait on anymore hardware for the time being. But I will definitely take this one into consideration when the time comes. : )
(Bookmarked the site for future use. Thanks!)