Which temp control unit? I'm the same way as you, I buy a bit of everything and see what I end up using to determine what I like. I'm on the fence with the temp control but as the prices are dropping I am getting real tempted to grab one of the new cheaper devices and decide if temp control is something I would care about.
I'm particularly interested in the joytech evic VT box mod unit. It isn't out yet and will likely be months before any real meaningful reviews, concerns or user experiences are widely known.
Temp control is still young, I've grabbed "the latest and greatest" a number of times in the past and gotten burnt.
Patience pays, let the cards fall where they may, version 2 of anything is usually better.