The Sony ES series is considered their best equipment and has an extraordinary long warranty.
As note before, the sound from most similarly priced equipment is going to have relatively the same quality. There are claims regarding sound emphasis... this receiver is bright... that receiver is laidback, but the bottom line is that your speakers and room will have a significantly greater impact on the sound than the brand of receiver. When there is an actual difference in the sound emphasis, the difference will actually be relatively small, and maybe not even be discernable in an A/B comparision, and in fact may be from a slight difference in the volume levels, or noise leakage from the tuner and other internal components, versus an acutal sound difference.
An excellent and very accurate response. Once you get past the power and the feature set is okay, I always recommend that the purchase of a receiver from name brand companies based on the remote control that is easiest for you and a significant other to operate. The remote is your interface. It is your keyboard. The easier it is to operate the receiver from the remote the more happy you'll be with the unit.