Goin Nuts I have Prochargers on my 502's and love it. It gives me a great cruising speed of 65-70mph @ 3800 with out being in boost. It also lets me run a 32 bravo which inturn gives me the great cruising speed.
Any of them should put you at 90+ and give you good cruise speeds. I have 871's on mine. Just my preference at the time I built the engines. Whipples are another good choice, but a little more costly.