Hi rchwallace,
Some points on each receiver (not complete by any stretch). All of these will sound just as good, so it's features/quality/reliability that matter:
SC-68
1. THX Ultra2 Plus certified (yes, it does mean something)
2. Menu's have a reputation of being byzantine/hard to use
3. 3rd generation class D amplifiers (runs cool, lot's of dynamic range, this is a plus)
4. 2K and 4K pass through
5. Pioneer has a reputation for quality/durability/reliability
6. Capable of driving 4 ohm speakers easily
7. Pioneer in-house custom auto-equalization system w/o subwoofer compensation
- Some folks consider Pioneers custom system a plus, others think it is a minus
8. Very gimmicky android/iphone app
9. Airplay support
10. Probably the best overall video processing
NR5010
1. THX Ultra2 Plus certified
2. Easy to use menu system
3. Audessey 32 bit auto-equalization w/subwoofer compensation
4. "Home Media" = ability to mount any windows hard drive and access it directly
- bypasses DLNA, so you can load mp3's, DSD, FLAC, etc directly without the meta data tags needed by DLNA
- It essentially is a linux samba server running on the NR5010
- This is a major plus in my book, much simpler to set up home media server this way
5. Push-Pull Darlington amps are proven design, but are less efficient.
- For each output watt into the speakers, it pulls more current from the 110V supply.
- They also are capable of sourcing/sinking current quickly (= wide dynamic range)
6. Rated for 4 ohm speakers
7. Spotty quality/reliability record (historically the last 3 - 4 years)
8. No option to pass through 4K signals
9. 2 year warranty
10. No main zone 12 triggers (zone's 2 and 3 only)
11. Amps are not fully re-assignable, only some fixed configuration options are available
12. No Airplay support
13. Second best video processing
AVR-4520CI
1. Not THX certified (the absence of certification isn't meaningful, but the presence of certification is)
2. Better reputation for reliability/quality than Onkyo, but not as good as Pioneer
3. 4K pass through support
4. Three year warranty
5. Completely remappable amp assignments
6. More energy efficient amplifier circuits than Onkyo, but no where near as efficient as the Pioneer amps
7. Reputation for cutting out when driving difficult low impedance loads
8. Probably the best user community (lots of high tech fans)
9. Airplay support
10. Video processing is of high quality, but not as good as the Pioneer and Onkyo
Some of this is my opinion. Don't bother bringing out the flamethrowers, I'm wearing asbestos underwear
