I was surprised when I found (Monster) that my maximum draw with TV, 7700, DVD, 990 etc was around 5.2 amps...loud. and I have a 60 inch Sony LCOS. I installed two separate 20 amp circuits when I planned the setup. I was going to put the amp on one and everything else on the other. Not necessary.

I can't advise you about the YAMAHA, but I can tell you that the 990/7700 combo is dynamite.

I hope this helps
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Living Room:
5.1 Surround and 4channel inline room
990/7700/6-KEF-107s/LFM1 x 2/ SMS Awaiting Trinnov
Millenium dts decoder;Digital Director
Players: Tascam CD01U/SonyCX455 x 3/DV955/BDP83
Old Sony 60" SXRD TV
Zone 2 (also liv-Room: listening to music while Mrs watches TV): Crown SL2 preamp/D40 Amp/Stax Headphones



My "Man-cave":
4 channel-only inline room. No TV (thank heaven)!!!
990/755/4-KEF 107s
Tascam CD01U/dts decoder/digital director
Alesis 16x4x2 mixer
Recorders Alesis HD24/ML9600/Crown CX844s/SonyDAT/Tascam DA38
Ham Radio Shack (KB1STH) ICOM/Yaesu/Drakes x 3