I have a Gen-X PCX-100, it's smaller than what you are looking for at only 1590gph at 0 head, and 1550 at 4" head.
I also have a Mag-Drive 36, rated at 3600gph (I have a new spare impeller for it as well). It's loud though, and I wouldn't run it in the house, but it would be fine for an external loop application where it's placed in a garage, out building, etc. When you get to the gph you're looking for, pumps are going to be loud.