question about return pumps for sump

[crysmom]

My husband and I are plumbing our new soon to be reef aquarium today.

Its a 110 gallon corner drilled 4 foot wide tank with a marinland tidepool2 sump

I have no idea what kind of return pump I should get? how many gph? the sump says 300-600 gph but can I go bigger? the stand is 30inches and the tank itself is 30 inches so there is 5 feet it needs to pump up i'd like a lot of flow