I would suggest getting a receiver that is a little smaller than the HK AVR 7300...and then buy 2 amps from Outlaw, and hook them up.
My brother recently attempted to upgrade the firmware, on the AVR7300, which malfunctioned. He went and bought another HK AVR 3-series (I think) and added two monoblocks, from outlaw. Total would probably be around 1000 or so. According to him, there isn't much difference, since the amps really help.
If I were to do it over again, I think that's the route I would go.
If you still decide to go with a high-end receiver I would recommed the HK AVR7300 at $999 BRAND NEW, with free shipping. Here's the link:
OneCall - HKAVR-7300 Good luck on the decision!