Not sure what your budget is but, Cal. Audio Labs model CL2500mca is 500 watts per channel X 5. It runs in "Class A" for the first 100watts with 400 watts of head room. It's a digital amp that does not run hot and requires less power from the wall than conventional Class A or Class A/B because it much more efficient.
Here is one for sale on A/gon for $3200
http://cgi.audiogon.com/cgi-bin/cl.pl?ampsmult&1073252587
Also, here is a web site with reviews and spec's on amp
http://www.deregle.co.uk/frames/frame13b.htm
Happy Hunting, Dave
Here is one for sale on A/gon for $3200
http://cgi.audiogon.com/cgi-bin/cl.pl?ampsmult&1073252587
Also, here is a web site with reviews and spec's on amp
http://www.deregle.co.uk/frames/frame13b.htm
Happy Hunting, Dave