Arguably (and certainly IMO), Sequence makes THE finest pumps. They are pricey, but they are incredibly good quality, quiet, efficient, and powerful.
I am not a fan of using the low speed pumps (snapper, dart, etc) as returns though. They don't handle a lot of head pressure and they lose a LOT of flow when the pipe size is reduced. Since they have 1.5" outputs and most people don't have 1.5" returns, you are going to have to reduce at some point.
I prefer the UNO series (Tarpon, Wahoo, Marlin) for return use. The other very very nice thing about the UNO pumps is that they use off the shelf Baldor motors, so if you ever need bearings or anything else having to do with the motor, any motor repair shop will be able to work on them, and for cheap.