Upgrade to McIntosh

I love the MC275 it’s a workhorse and a tank! I wouldn’t pair it with a Mac pre however as the sound is on the dark side I much prefer a CJ like a ET5 is a steal used for the $ and hard to beat. Also tho are you doing the MC275 because it will be on almost all the time or ? As way better soundstage with a CJ amp also but not made to run 8days a week like the MAC. I’m closing do separates but not mono blocks imho I’m very happy with my VTLS200 (another versatile well priced used amp🌟 but if you have efficient speakers and love the MC275 go with it my Uncle loves his and I do to for what it does it’s truly a gem

Ayon IS great stuff, but not always easy to find or contend with receiving those beasts on a pallet.  I too have an MA12000, but find it more than awesome in my setup.  Both units are beautiful in their own way and a joy to be around.

Even the McIntosh SS amps are warm sounding. If I ever go back to tubes, it will be only in the preamp section, I never got tight bass with tubes.

Check out the new McIntosh gear, they are hybrids with tubes for midrange/tweeter and large SS for woofers in 1 chassis. 
As for a built in dac, these are always a compromise over a separate dac. I used to have the McIntosh c47 preamp with phono and dac. I played this dac for 5 minutes and never went back to it, my standalone psa ds sr dac sounded much better.

FWIW, MC275 has a very low output impedance for a tube amp, so its bass is plenty tight, so much so that some tube aficionados don’t consider it “tubey” enough!  That said, you may want to look into a VTL ST150 and TL2.5i for a comparison if you can find them. Very high quality and great sound that might surprise you.

I auditioned the Olympus Nova V with the MA12000 and it sounded quite musical with a great soundstage. In the end I went with Wilson because I thought that the Wilsons were less likely to be knocked over. It is easy to find a dealer that represents McIntosh and Sonus Farber. I wanted the McIntosh resale value, but I know that they carried other amplifiers that would have improved upon the MA12000. You best A/B Sonus Farber with the equipment you are considering vs buying based upon our suggestions .