Time to buy a pump but I need some help

[WWWD]

Your kind of limited on your choices for pumps if you want to go submersible mag, sedra... The kicker is that submersible pumps for large sized tanks can be pretty loud and transfer heat into your water. I would suggest you reconsider how you have your sump setup and see if there is a way you can get an external pump in there somehow. Maybe even on a shelf or outside the stand.