Do not mistake return flow and turn over flow. Return flow need not in excess, if to great your skimmer and any reactors will not operate a peak. The overflow must also be able to handle the flow. Return flow should be anywhere from 1 to 3 times. The flow rate/turnover flow rate within the aquarium should be anywhere from 5 to 50 times depending on contents. You should not depend on your Tank return to supply the display flow/internal flow for inhabitants. You should look for a cheaper return, not in quality but just in general cost. Take a look at Eheim or Sicce and spend more on a good quality Wavemaker, Gyre, Vortec. If you want to get your return involved in some form of display flow you could put a Sea Squid on it or better would be a Sea Swirl.
Many people tend to look at Over flows into a sump as a Canister filter and they are not, almost all of the water going down to the sump is surface water that will contain Oils and floating debri. The stuff you see floating around in your display will either be broken down by the current and hopefully be caught up in the oils on the surface and flow to the sump and the skimmer can remove along with any Carbon you maybe using, or will settle onto Rock Work and on Bottom and either brake down in time into Nitrate or be siphoned out during water changes.
1 to 3 times does not sound like much but look at like this, if you took the pump and put it into the tank and added a hose and draped it over the side and it was pumping the volume onto your floor at 100 gal/h to 300 gal/hr well that is a hole new perspective.
Anyhow just my 2 cents.