Building a new system.

It's a 60 gallon tank with a 40 gallon breeder sump.
I plan on using an external pump and want to plumb in a water change system as well as using it as the return pump.

Looking at the Pan World 50px at 590 GPH or the 50px-x at 1110 GPH.

Difference in price is negligible. I will also probably be running a Sea Clear cartridge filter and UV.
I'm leaning towards the 50px-x. Will that be too much GPH?