let me give you an out of the box suggestion.Get 5 individual Accoustic Reality 1001 mono amps,they are rated at 500 watts@8 ohms and 1000 watts@4 ohms. I just purchased a pair direct from the manufacturer I paid atound $1700. including shipping.They way less than 10lbs each look great,and most important sounds GREAT. they replaced a Gryphon S100 amp used in single channel to drive center speaker,and a Classe 201 to do the same in my second system.I strongly recommend that option for max flexibility, looks,low heat generation,and ofcourse sound.For more data on the amps you should look up the manufacturer they are listed on audiogon.
Ramy
Ramy