Hi Gary, Lots of variables to consider.
Your right about trying to cycle the Fish tanks water about twice an hour
If your adding air pumps, or venturies or spray bars to your return, you could cut back on the flow 'some'

Most important thing is the 'head'. How much water will a pump push at a certain height. Most pumps will have a 'perfomance flow chart'. Really need that info to make a good decision.
Second,check the wattage....some pumps use more then others (for the same flow)

Badflash is using Intex swimming pool pumps. He seems happy with them....they don't cost too much and are pretty good on the watts used.
Danner pumps are pretty good...so are Little giants

I have 2 pumps returning water to my fish tank...if one stops working, at least I still have some flow. If your really serious.... have them on separate circuits.

Hope this helps some. Lets see what the other guys say...