Ball valve will work just fine for the return shut off. I like using the Spears gate valve to regulate the drain. They turn so smooth and are built very well.
I prefer DC return pumps. They are adjustable so you could get one slightly overpowered and turn it down to suit your tank. They also slowly ramp up when you turn them on from say, cleaning or feed mode, so they don't all of a sudden spit the full flow of water out all at once. It doesn't water hammer (big slug of water rushing thru empty pipe, you should hear 24" steel pipe hammer and shake back and forth :eek:;Nailbiting) your plumbing and there are less micro bubbles blasted into the water on start up.