I have an ATI BM 250,I like it although pumps can have restart issues, I also found it important to keep a constant water level in my sump with a auto topoff unit.
I dont have either of those but I have the Hurricone Cat 2 external with an Askoll Pump on about 425 gallons and it is awesome. Its also on sale at ReefSpecialty for like $649 plus an extra 10% off sale. Just a recomendation, check it out.