Pedro,
With a FOWLR tank, we recommend a pump that can move 5-7 times the tank volume. In your case, you need a pump that can move around 1800 gph at 8 feet head pressure.
I would actually recommend the following:
http://www.coralvue.com/reef-octopus-water-blaster-12500-pump
or, the 16000 which will give you more than you need but you can always install a gate valve to adjust flow.
http://www.coralvue.com/reef-octopus-water-blaster-16000-pump
Both pumps will give you the necessary water movement at 8' and will allow enough pressure to be able to Tee off to a reactor and other equipment.
HTH,
Carlos
CoralVue