I think I'm pretty set on picking up a crane spark box for my '94 Z. I dont know which one to get though...big diference in price and not enough details. there's the hi-6s which is $140, the hi-6 which is $215, and the hi-6r which is $240 and the one gmhtp used in their mag. Is any one box better than the other?

Also wondering if any experienced any problems running a crane box with an MSD coil...