I use the Reef Dynamics BP reactor. Make sure you purchase a reactor that is recirculating and has adjustable flow output.
Please get into trouble to BP reactors but having them run 100% wide open all the time only to complain that their corals are bleaching.
Having your BP reactor running 100% full on, all the time, could potentially strip your tank of nutrients and starve your SPS (if you keep SPS).
I like mine, keeps my Nitrate close to ZERO and the Po4 close to 0.02.
Matt.