I have the RB75's with the 770 amp and life is good. It is awesome, not overpowering or bright. You will never regret "extra" power. You can always use more headroom. Good Luck!

Ray
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Raymond Romero

Home Theater:
Klipsch Reference RB-75's
Klipsch Reference RC-35
Klipsch Reference RS-35's
Dayton Titanic 15" kit
Outlaw 950 pre/pro
Outlaw 770
Samsung 46" DLP
Toshiba VCR/DVD with 1080i upconversion
Directv Hi-Def