Velocity RDA by Tobeco is an excellent clone. However, it's dual coil only. All the original Mutation X versions are excellent and fair priced. They can be build for single or dual coil use.
For sub ohm tanks look through the thread http://vapingunderground.com/threads/subtank-wars.60527/
Love my Sigelei! Works very well with my Tobeco Turbo2, Mutation v3, Derringer, and Kanger sub tanks. It does not, however, play well with my sub tank minis....
Not sure about the temp control sig 150, but the regular sig 150 is a great device. Firing down to .1 ohms and going up to 150 watts lets you pretty much run what you want how you want. Nice buy. Good luck finding atty's that work out for you. +1 on what Neunerball said.