I'll second the DNA-500 - have had mine about 8 months and am continually amazed at its performance. I leave mine on all the time and don't have heat issues at all - it just needs a little room to breathe in my rack. Dynamics are incredible when called for, yet inner detail and transparency are also there in a very involving, musical way. My system includes a VAC Phi 2.0 preamp, APL-modded Denon 3910 and Legacy Whisper speakers.
Maybe you should try the McCormack in your system if you haven't already?
Maybe you should try the McCormack in your system if you haven't already?