My HT room (i.e. living room) is on a 20 amp circuit. If I take the ratings from all the audio amps, I'm at around 4000 watts plus TV, DVD player, crossovers, lamps, etc. and I have never been able to pull more than 11 amps through the circuit, no matter how loud I played anything.

I think the HTS 2500 will work just fine but I agree with Wayne about plugging straight into the wall with the 770. By the way what happened to the 770 that it needed repair?