How old is the pump and how did it "die"? What was the make/model?

If the wet end is in good condition, you could just replace the current motor with a two speed motor and save some money.

If you need a new pump, what was the supply voltage for the old pump and can you change it?

Given the flow restrictions on your filter you might want to stick with a low HP two speed such as the up rated Superflo 3/4 HP.