I suggest a Provari and an IBTank. If you look on the advanced search option on this forum, there are plenty of reviews (and people that love them). The Provari is pricey initially, but it will last you a very long time. Good luck!
I've had my Provari mini since 12/2012, and I've never had a single problem with it. I used it exclusively for about 8 months before I bought my first mech, and now I switch back and forth between my Provari and my Nemesis, depending on what topper I want to use.