I'm using a little giant FE2000 mag drive pump that I bought from a plumbing wholesaler for 128 bucks. Seems to be working fine. I hope it continues that way.
90 gal tank, 33 gal undersump, rated 1450 @0'head, 1200 @ 4'6" It is in Little Giant's Pond Pro catalogue. All ABS housing. I've heard ABS is bad because of petroleum content though. don't know for sure.