I ran (3) Hydor Koralia 4's (850gph) in my old 75g in a gyre setup supplemented by 950+-gph return pump. It was plenty until corals matured so added another K-2 but still could have used more. I run (4) of the Hydor Evo 1400's (1400gph)in my current 125g along with about 1100gph return and like it just fine for now. Will probably slowly upgrade to Tunze PH's as this system matures but still have a hard time justifying the cost of these and Vortech's. I think you'll be much happier with alot more flow in your system.
Cheers, Todd