My $0.02 on the subject is a vote for the Protank II, and maybe the Protank III (haven't tried this one yet) AND/OR the iSmoka BCC (Mega or mini). I have had awesome success with all of these that I have tried. No leaking from any of them, long coil life, and most of all GREAT flavor and good vapor. I usually vape with 1.8 or 2.2 coils on an evic and get between 2-3 weeks out of a coil before I need to clean or replace it. The one problem I have found is with the iSmoka BCC minis, they tend to wear out and break right where the threads are at the base of the tank after 4 or 5 months of steady use, but if you take care of them, they will last quite a while. I have not had a BCC Mega do this yet. For the price, they are fantastic!
I vary my flavors a lot, so I have a lot of tanks, somewhere around 4 each of the iSmoka's, 2 Protank IIs, 1 original Protank, 1 T3S clone, etc ... I like all the coils listed above but have had the best success with the ones I listed in the beginning. I also have some EVODs, but ABSOLUTELY HATE them. From day one they gurgled and leaked juice everywhere, no matter what I tried.
YMMV, I hope this helps!