Which Eheim return pump???

[Buddyboy]

Hi All,

I'll be picking up a submersible return pump very soon. I have decided i'll get the best and spend some extra $$$ and pick up an Eheim. My new setup is a 50G display and a 15G sump. I was thinking the Eheim 1250 (~200 gph) would do the trick. Is this enough flow through the sump? Or would the Eheim 1260 (~500 gph) be a better purchase? I don't need the pump to add flow in the display tank as I have powerheads doing this already. Your thoughts? Thanks for your help!

Bud