I've got the Denon 4800 driving my M&K S-125's (nominal 4 ohm load). The 4800 handles them with ease, with seemingly plenty of power to spare. Even during the wildest action movies the receiver never gets really hot and I don't think I've ever had the fan kick on.
A couple of years ago I purchased my Denon 4800 receiver from ecost.com . Have had no problems and got a great price, $1,400, when the receiver was going for $2,000.