I do not recommend you buy any older Pioneer Elite receivers before the SC-79 series (definitely do not buy the SC-50/60 series). They were all made using a specific TI DSP which TI has reported to be defective. The DSPs have a failure rate of 83% at two years. If you were to repair the unit, they would replace the HDMI board with a new one that has the same defective DSP which means the unit will fail again.
Since the units generally failed after two years, the warranty will have expired so Pioneer is under no obligation to repair the units. The board costs about $500-600 depending on the model plus the cost of labor.
Regarding the sound. I like the Pioneer "digital" amps. They are very powerful with a lot of power reserves. They run cooler and can handle 4-ohm loads pretty well. Compared to most other brands, they usually test with about 50% more power when all channels are driven (the only brand to test as good are the top Onkyo models, but they have reliability issues). They sound more dynamic than Class AB receivers but to some, the Pioneers may sound a bit harsh.
My thinking is that most newer AVRs are pretty lightweight, literally. The top line Sony ES, Denon, Yamaha and Marantz receivers are all rated at around 125wpc. But when tested with seven channels simultaneously, they are pretty weak, roughly around 60-80wpc. The Pioneers have generally tested about 110-120wpc all channels driven. All the other brands top out at about 30 lbs. Five years ago, top line AVRs were about 50-60 lbs and they had a lot of power. The reason is that the older models had really big power supplies with large capacitors which made the units more heavy and with bigger power reserves for more wattage.
If it's not a BIG screen, it's not a theater...