I'm adding a 5 channel external amp to my HT system specifically to power my PSB 9C an 6Ts (and leaving my 2 surrounds to my receiver's internal amps). The extra 2 channels are for some time in the future when I buy 2 more rears for a 7.1 system. I've been thinking about the folllowing amps: -Marantz MM-9000 -Rotel RMB-1075 -Acurus A125x5 Has anyone used one or more of these? Does anyone have any other suggestions in the $500-700 range (which translates to $900-$1500 retail). Thanks.