New Amp Advice

I’m at the airport, where do you live, I just invited myself over.

I never heard your amp or speakers, but my instinct is to change the speakers, not the amp.

The Stereophile review of that amp

https://www.stereophile.com/content/rotel-michi-s5-power-amplifier

makes me want it, despite the fact that neither you nor I need anywhere near that much power, it’s too heavy to handle, and I have a rule about avoiding potential fan noise, and, I prefer tube sound and am willing to buy my own tube testers and put up with them.

It’s a big room and a big budget, I would go for speakers with no ports, no side or rear output, properly aimed and angled to deliver maximum primary sound waves (improved imaging your stated goal), minimum floor, ceiling, side wall, rear wall reflections.

I would love to hear these sealed boxes in your space

https://www.ebay.com/itm/175688092340?mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=5338381866&toolid=10001&customid=4c9fc5f2-d8cd-11ef-8860-646364343162

Seller says Rosewood, but I believe they are simply a red stain on a more common wood. I owned and loved the JSE Model II’s, loved them, but missed my Vintage Horns/15" Woofer I inherited from my uncle. I still listen to them at my friend’s home, a big room like yours in a Firehouse he lives in.

My speaker preference is directional horns, large woofer, efficient to avoid need for amps with cooling fans and to allow alternate use of tube preamp and tube amp(s).

I understand hesitation to get into tubes, however, efficient speakers provides rather than precludes the option.

Once you hear those Model II’s in your space, then I would strip the drivers, and have my woodworker cover them with a select veneer, make them look as gorgeous as they sound.

I put some info about JSE Model II’s on this site

https://www.audiogon.com/systems/11418

Appreciate all of the suggestions thus far and hope for more.

I am interested in Audionet and would also appreciate knowing more about how they differ from coda. 
@jasonbourne71 I respect what you have to say and always enjoy your comments. I agree that what I have now is a good piece of equipment and noted that I would only upgrade if I could hear a significant improvement. Just exploring the last piece.  never thought of myself as a one percent guy. Getting ready to be 68 years old, worked from the time I was 12 and fulfilled every financial obligation that I had to my family. Only responsible for me now, so I figure it’s OK to indulge what I like. For me, it’s not expensive watches, or cars, or trips around the world, it’s this stuff.

has anyone heard what the specifications and price might be on the new Audionet  and the new Boulder amps that are coming out? That could be interesting.

thanks again for the suggestions. Cheers.

The incremental improvement possible over the Mich is very, very small ( unless you move to tubes) and it can control every speaker you might desire - they don't get much better.  There is considerable room for improvement to your speakers, turntable and cartridge.  and you didn't mention any subwoofers.  

Also, I tried spikes, with my JSE Model II’s, heard no advantage, changed them to 3 wheels (more weight/per wheel than 4, and auto-level, no shims needed) (and anti-tipping blocks in the rear corners).

It is far more important to maintain ability to re-position speakers for advantageous imaging in a space for single or two listeners, I put something here about that too

Toe-In Alternates, Stereo and Video

I would reach out to Will Kline (formerly of Sonus Faber), I believe he's now at Shunyata.  I would trust his opinion, he will likely get you going in the right direction.