I am getting fantastic vapes with a DCT setup. It works by surrounding a cartomizer with eliquid in a tank.
This tank is a locking DCT. This means there is a groove and a nut at the bottom of the tank to hold the cartomizer. There is no way it can pull out on you, which is one of the potential issues with tank set ups.
http://www.madvapes.com/artemas-locking-510-dct-clear.html
The cartos are replaceable, and will last a few weeks each. They cost 2-4$ each.
http://www.madvapes.com/smok-tech-30-ohm-steel-dual-coil-cartomizer.html
If you get one, keep in mind, there are two different sized tanks and two different sized Cartomizers. I personally use an XL tank. It holds about 6ml. I'm pretty sure it uses 44mm (I think) length Cartomizers.
However ask your vendor to match the cartomizer with the tank the first time to avoid any mismatch.
Here's a video on how to fill the tank:
http://m.youtube.com/watch?v=4jOU-P5lNro&desktop_uri=/watch?v=4jOU-P5lNro
Though you can ignore the warning about the tank sliding off, if you buy the locking DCT.
Also, some vendors sell a tank fill tool that speed up filling. Get one
This setup produces the best vapes of anything I've tried. It works well on EGo batteries also. It requires an adapter for airflow if uses on my provari, because of the way the tank seats. On the eGo twist, it's perfect.
Typed on my mobile. Please excuse typos.