I have 3x400w MH on my 200. I use an Aquacontroller 3 to control my lights, pumps, fans and heater. The controller turns the fans and heater on and off to maintain the target temp. In the summer, the controller turns off the MH sequentially if the temp gets too high. Saved my corals from getting cooked several times last year.
If you want to control the lights and heater only, an Aquacontroller Jr would probably be fine. I started with that and then upgraded to the AC3 because there is an iPhone app for it that let's me monitor and control the tank remotely, important for me because I travel lots.
I bought my AC3 used on RC and am very happy with it. I have 2 DC8's for a total of 16 controllable outlets. It has temp and pH probes. If you are willing to spring for it, the new Apex controller looks very nice and has excellent reviews.
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