I have the denon s510bt and I'm pretty happy with it. a little more power would be nice, but it wasn't in my budget. though I live in a house and still have enough volume to piss the neighbors off. lol
plus I like having audyssey (comes with denon receivers) to help give me a baseline for crossover settings, levels, distances, etc.
lovin is right. your speakers are going to be the key component to a good sounding system over the electronics, though I've always been partial to denon or yamaha.