FWIW, I used the 1000hp Stealth C5 Aeromotive pump in my ProCharger build this week (619rwhp). We're very happy with the results and the room to spare.
It is an in-tank pump and is noticeably noisy, but not unbearably so.
We called Aeromotive about the Speed Control for our (relatively) smaller build, and they couldn't give us a reason why we needed it, so we didn't get one.
Padre