For a tank with stock coils, I'd have to recommend the Herakles by Sense. It wicks high VG juices very well, and if you don't throw 100 watts at the 0.3 Ohm coils, you'll never get a dry hit.
I have gotten very tired of replacing coil heads at nearly $4 a pop, so I am retiring most of my subohm tanks, and using RTAs and RDAs exclusively (once I get through the few remaining coils I have stockpiled). I'm expecting a huge decrease in funding my vaping habit.
To that end, I have purchased two different RTAs, and have a third on order (it should be here tomorrow)...
I have to recommend the Cthulu v2. If you wick it right (yes, it takes some practice) it won't leak a drop, and it comes with two build decks (Kayfun style, and Velocity style) which lets you build nearly any way you like. It has been an excellent all around tank...vapor and flavor for days.
I'd avoid the Mutation X RTA. It has HUGE juice channels, and it is very picky about how much wicking material you use, and if you get it even slightly wrong, it'll leak every time you fill it. It also lacks any kind of juice control. If you do manage to wick it properly, it produces vapor well enough, but the flavor seems muted.