I use my Mutation X2 occasionally, but it has too much airflow for me and i never really like any builds I did on it. Always seemed to be too close to the edge and wouldnt wick well from one side.
Igo-w was good after opening the airholes a bit.
I just got a velocity clone I am going to try on this weekend, heard good things about it.
I started on a magma clone, which while it was good at the time, is quite outdated now. I would like to hop on the oldschool bandwagon and recommend it, there are better options out there now.
Sapor, derringer, doge, freakshow, mutation X4, Troll, all on my "to buy" list. But my money has been going to RTA's instead. I prefer them since im out an about most of the time and cant drip.