Red Dragon pumps are great, but they cost ALOT of money. When i was buying a main pump for my tank when I was setting it up, i was choosing between red dragon and reeflo. i chose to buy a reeflo dart, because red dragon's equivalent pump is $1000, and only 3150 gph. (and just not worth it!)
My advice to you would be to try sedra pumps. My explorations in the past, as well as conversing with other hobbyists, has been that mag drive and quiet one pumps are okay, but if you want quality, go sedra. (
http://www.jlaquatics.com/product/wp...ater+pump.html) Mag drive tend to have a rattle in the sump. The flow rate may not be a Dart, but then again, you wont ever get that kind of flow without a large, external motor. In that view, the sedra does have quite a bit of kick.