Which solid state power house: Naim NAP 500DR or McIntosh MC611?


All else equal, which would you buy?
jeredh
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@jeredh 

Great choice. Are you using the Naim ND 555 streamer/DAC with a 555 PS DR power supply unit? You should have gotten the NAC 552 linestage preamp with a 555 PS DR, not the n272. It will make huge difference sonically. 
Additionally, you might want to add a Naim Uniti Core Reference music server to connect to your Naim streamer/DAC. It will make a big difference too sonically. It will sound better than having your computer or NAS feeding your Naim streamer/DAC. 

I am a big Naim fan boy myself. I personally own the Naim Statement NAC S1 linestage analog preamp and the Naim Statement NAP S1 monoblock amps driving a pair of Magico M6 speakers in one of my reference setup/system. But I'm not using a Naim digital streamer/DAC. I have a Clearaudio Statement v2 turntable with a TT-1 Statement tonearm, Statement Goldfinger cartridge, external separate class A linear PSU for the turntable & a D'Agostino Momentum phonostage pre. 
For digital front end source components I have a MSB Select ll DAC with its flagship Femto 33 clock and 2 mono separate powerhouses or 2 mono power supply units (one feeding power to its digital side of it and the other feeding power to its analog stage), MSB Select transport with its external separate PSU, Naim Uniti Core music server. 

I also have a Naim Uniti Nova all-in-one box integrated solution (streamer/DAC/integrated amp) driving a pair of Sonus Faber Olympica l standmount speakers in my bedroom setup. 
I just switched to Naim 300 DR with 300 DR PS and NAC 252 with supercap power, using Linn Klimax DSM for digital front, Sopra N3 speakers. It has added a new dimension to my listening. Very detailed, forward sounding,  timing is superb. vocal is almost life like.
I also have Bryston  7b3 mono block and Auris Audio Forte 150 Tube Mono block , Audio valve eclipse preamp.
I personally prefer the Naim SQ.