<font color='#000080'>It's really up to your taste in features and performance. In the same class you have Yamaha (who provides no OSD for that price point, but more DSP options), Denon, Pioneer, H/K, and Sony... of course, there are more...
While other amps have reputations of being beefier, etc - unless you are really going to crank up your music to insane levels, the Onkyo will do very well. And try to disregard "volume" knob settings as all amps are different in how they ramp up to their max amplification levels.
So for a $500 receiver, I think features play just as much a part in the decision as the sound. Take a look at your options and see what you find. But overall, I was pleased with the Onkyo for the price. Heck, my RX-V3000 doesn't let me set input levels!</font>