Here's a good way to see it...

If you don't plan on going past 10 psi, then get the GReddy.

Otherwise, go custom or get a DRAG kit.

If you do plan on getting the GReddy, you don't need that big $900 intercooler, the small one is fine and you can get a PWR, Spearco, or Precision for much less. I run the Spearco intercooler that came with my DRAG kit, it's been proven up to 450+hp.