I had a really similar dilemma when I was planning my system...and what Pedro and I finally came up with was sizing the return pump to be large enough to not need any internal pumps. I originally planned to have a pair of gyres mounted vertically on one end of the peninsula, or having a pair of MP60s on the far end and using the return to push back towards the overflow. What I ended up doing was getting a Reeflo Hammerhead for a return, and since it puts out 5500gph or so, with some properly angled return nozzles, we didn't need to add any internal power heads.
Now, that said, I was lucky enough to have a large external overflow, which was big enough to be able to fit two DC pumps each pushing 3500gph as a closed loop system. That really made the difference.
I know you ordered the gyre already, which I've heard is a great pump and low profile, so maybe size your return a bit larger so you won't need anything further...maybe add an oceans motion unit to randomize the return flow to different corners of the display. With that you should be good...of course depending on what you want to keep in there.