I use a ReefKeeper 2. Quite happy with it, can control alot of parameters with it. Tank is too cold? Turn on heater. Tank is too hot? Turn on fans/chiller. Also you can control kalk/calcium reactors off a ph probe if you get that. Has a wavemaker function with softstart. Timers, standby mode, nightmode. etc etc. Check it out:
http://www.digitalaquatics.com/m_pro...er=30-0005-000