Amp recommendation need

I'd go with an Ayre amp. If you wait, you could probably score an MXR for about $6K (I did).
Or, buy a couple of McCormack DNA-1's(preferably broken) and have Steve at SMc Audio do his magic. 
B

As ususal good advice from @gdnrbob.  I would wholeheartedly endorse his second option.  I'm listening through one SMc Audio upgraded DNA-1 now.  I can only imagine running 2 as monoblocks.  BONUS:  Short speaker cables!

Bel Canto REF600M. Read the reviews. 

There are so many great amps..... my only advice would be to audition in your system if possible.  Mono blocks are great but there are some fantastic stereo amps at your budget

Thanks hifiman5!
I have just set up my DNA-1 monoblocks and am letting them break in.
1st impressions show them to be very impressive. I tasked Steve and Pat to make me something to give my Atma MA-1's a run for the money. 
I think they did it.
True that there are great stereo amps out there, but if you can set up a pair of monoblocks, do it.
Short speaker cables are definitely in you best interest in getting the best sound. Also, running balanced cables from pre to amp also provides better sound ( as opposed to RCA), and you can run them longer without degradation.
B

Thanx for your input - how about a Pass Labs 250.8??

I would never turn my nose up to a Pass amp.
My ancient Adcom 555 still works like it did 30 years ago.
There seem to be a couple for sale here on Audiogon, too.
B