There are a million of them. Just depends on your budget. I'd avoid the DCT tank. The price is the only good thing about them.
For a reasonable price, the J-Tank and Mom & Pops tanks get high reviews around here.
The Phiniac tank is also nice and fits on a LT and looks great.
If money is no object, the ultimate might be the "Who's your daddy" tanks.
The Lavatank is also great, if you don't mind stalking the forum every Friday night trying to be one of the lucky lottery winners.
I like the Vision Stone tanks. They don't take separate cartomizers. They look super neat on a Lavatube and they last a long time. The version 2 is on sale for $6.95 at virginvapors.com The Version 3 is out and has replaceable innards. They're about $10 at ecigarettesonline.com The spare guts are sold at gotvapes.com but they're out of stock. They do have the best pics, vids and info though.