Niles Audio SI-245. I was using this as a surround amp for the back two channels of a home theater setup, but now using it as a main amp for a 2nd system. Very powerful for its 45w/ch rating, very clean non-fatiguing sound, very well built (large transformers, can drive inefficient speakers, solid chassis), and has level controls for each channel. I think it's a great value as it's list price is only $400.
http://www.nilesaudio.com/product.php?prodID=SI-245&recordID=Stereo%20Power%20Amplifiers&categoryID=System%20Integration%20Amplifiers&catcdID=4&prdcdID=FG00795
http://www.nilesaudio.com/product.php?prodID=SI-245&recordID=Stereo%20Power%20Amplifiers&categoryID=System%20Integration%20Amplifiers&catcdID=4&prdcdID=FG00795