RW,

While I heartily encourage you to buy equipment from Outlaw, the GFA-7500 is a nice amp. If you just need two additional "back channels", it might be more cost effective to get a pair of Outlaw M200 amps to drive them rather than tossing out a perfectly good amp. Outlaw does make nice multi-channel amps, though. I'm very happy with my 755.

Cheers,