i recently had the rotel rb-1092 in my system. delivers the power you are looking for at 500x2watts. i thought this was a very nice sounding amp with my B&W 804S. you could always get a pair of the rb-1091 rated at 500x1 if you must have mononblock(s) :)
several of either amp for sale on AG and ebay.
several of either amp for sale on AG and ebay.