Going through a similar search not long ago I've purchased an Onkyo TX-SR800 ($678 from an authorized reseller through mail order). It has 100 Watt per channel, 7.1, any 2 channels driven. I'm very happy with it. Of course, having bought this receiver I'm biased so this information is worth what you paid for it. I'm sure you will hear from others, speaking passionately about their particular receiver.
IMO power is not all that important for choosing a receiver. Different brands have different ways of specifying power that result in similar numbers for what otherwise would be vastly different. In practice there's very little audible difference between, say, 80 Watt and 120 Watt. That's only 1.8 dB, audible but barely so.
You can even look at the Yamaha receivers. The RX-V1300 is a 6.1 receiver with 100 watts x6. You can even get the Denon AVR-2803 for the same price of the RX-V1300. It has a seventh channel, but only rated at 90 watts x7. I doubt you will hear a dramatic difference from the 90 watts and the 100 watts. Just to let you know to hear a double increase in volume you need a 10 dB increase. 90watts from 100 watts won't even com close to that 10 dB. even something like 50 watts to 100 watts, Which will only give a 3dB increase in volume.
Here are the links to the Yamaha RX-V1300 and the Denon AVR-2803.
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