Mags are good pumps. You can run it external too and free up some space in the sump. I'd invest in 2 nice external pumps that put out about 1200 gph each. Then closed loop them with intakes near the top of the tank and have outputs all over. Oceans Motions makes some nice little devices for alternating the flow. The nice part about a canopy is you can mount your plumbing above the tank and have it enter the tank with loc-line. You can then adjust it so the outputs are just barely touching the water surface; you don't even see the outputs in the tank at all. Makes it look nice and clean. 
