Really sump turn over should be the rated g/h that your skimmer is for the most effective skimming.
My favorite pump is the water blasters from super reef octopus. Quite, efficient, powerful, 3 yr warranty. They are pricey tho, but good equipment is worth it.
Herb,
This one if just using as a return...
http://premiumaquatics.com/aquatic-supplies/LG-ARP440110.html
Now, if you want to plump reactors like GFO & carbon, and plump both 10gals a certain way.. Also could help with less PH's IMO.. No need for MP 10's
Go with the Q3000 as you will be losing gph with all the plumping..