The return will also be based on what you plan on doing for extra circulation inside the tank. If you are going to be using Seio's or Tunze's, or even the Vortech, you could just drop a standard PVC return in. If you want to spice it up just a hair you could use some locline fittings to get some more direct flow.
If you don't mind spending the money I think I would opt for Seaswirl or a Wavysea on the return line. Combine that with a 3-4 MJ1200's pulsing on and off and you should have a perfect, random, flow inside of the tank.
Thanks,
Jeremy