I would expect someone to confirm this but, while researching similar, someone suggested;

http://www.outlawaudio.com/products/200.html

This brand is internet sold as Axium speakers are. They sell the individual, single channel, 200 watt @8ohms or 300 watt @ 4ohms amps to add to your receiver.
My thoughts would need to be varified by one of the local experts, but you could power your mains with these and use a smaller 100 watt multi channel for the rest of the speakers.


M80 VP150 4-QS8 EP600 Monitor Audio S8 NAD T 773 Anthem MCA3 II Hitachi 57" projection