Multichannel Class D amplifier for multi-room sound

How many watts do you need?   Are they the same wattage for all channels?  

It might be a lot easier to simply buy two 6 channel amps, they are more common and you can probably get more watts for your dollar, too.

Thanks spatialking.  Good suggestion.  The Russound puts around 50wpc into 8 ohms and 80wpc into 4 ohms (one zone driven) and that seems to be plenty.  It costs $1000 to cover 8 pairs of speakers.  We need to cover 6 pairs.  Suggestions?

Parasound has a number of products designed for this, under the "zonemaster" line.

I bet that would be a good option.  Parasound is $1200 for 6 pairs of speakers. Anything better bang for the buck out there?