I am also a fan of the Protank 2s, in my usage they have been just about bullet proof. However, you asked for other recommendations, so here is what I have found. YMMV!
iSmoka BCC (Mega or Mini) - This is my second favorite tank. Pros: Lots of vapor, good flavor, holds plenty of juice (mega), cheap, replacement coils cheap. Cons: Plastic tank, Mini version splits at threads after about 3 months of filling/usage (have not had the prob with the mega version, thicker plastic?)
Protank 1 - Pros: holds 2.5ml juice, cheap coils, looks nice. Cons: Non removable drip tip, airy, leaking/gurgling, glued together poorly, you name it.
CE8SS - Pros: Holds lots of juice, cheap. Cons: This thing just sucked. the flavor was awful coming out of it, and I had a lot of problems with it leaking no matter what I did, way to airy draw.
CE5 - Pros: Good capacity, nice flavor/vapor, cheap. Cons: Top coil, and all the issues that go with them. Heads gunked up a LOT, leaking/gurgling, plastic tank, did not perform well with thicker juices, you name it.
EVOD - Pros: Nice fit and finish, looks great, holds up well, uses same Kanger heads as PT series, comes in nice colors. Cons: Plastic tank, small(ish) capacity, LOTS of leaking/gurgling problems, built in molded drip tip, thin juice window (hard to see how much is left in tank).
Kanger T3S - Pros: Good capacity, solid vapor/flavor, changeable coil, no leaking/gurgling like EVODs. Cons: NOT standard PT Coils, Plastic tank with molded drip tip.
Kanger eSmart - Pros: held up to abuse well, great vapor/flavor, cheap (5 tanks about $10). Cons: Small capacity, disposable (not rebuildable/replaceable), plastic, not standard 510 drip tip (CE4 maybe?).
iClear 16 and 30S - Own these, have not tried them yet, heard great things about them though.
HTH