Responses from chocaholic

Highly recommend an AU-717 integrated. I have one bought new in 1980 and recently had it restored. A stunning piece that rivals many modern integrateds…and a classic well respected by many. Although not in use currently, having owned it for 40+ ye... 
Benchmark or McIntosh....
Between the brain and the heart, heart always wins in the end. Save yourself some grief and go with Mac.   
Getting 2 subs
And you should try positioning any subs asymmetrically.   
How easily can you distinguish between different DACs?
@audiodwebe Im with you. I struggle to hear many of the differences that others seem to. For example, I enjoy the SQ of Spotify and although Qobuz occasionally (depending on the recording) sounds different, I wouldn’t say it necessarily sounds bet... 
New Speaker advice
On the Revel side, consider the F208 also. Lower bass and bi-wireable along with the ability to adjust tweeter output and bass to fit your room. Also on Focal, their 948 may provide similar benefits and both should be well within budget on the use... 
New to Streaming
I’ll be the lone voice of dissent regarding Qobuz. But I agree regarding the BluSound Node. You can later add an external DAC and LPS with notable improvement along the way.    I much prefer the content management of Spotify and find the SQ diffe... 
McIntosh MA352 Mirror Finish Scratches
I have the same amp but have only cleaned with the stainless cleaner my wife uses on kitchen appliances with good results. You may want to consider automotive metal polish (non abrasive). It works incredibly well without scratching.   
SNAKE OIL! A new TV Show hosted by David Spade
Mpingo discs, carbon fiber outlet covers and cable lifts. Snake oil?  I think not!  
Does anyone repair....
Check DIYaudio for suggestions. I found a chap in MS there who did an outstanding job restoring my Sansui AU-717.   
Integrated Question
How are your subs connected?  Speaker level?  You may want to reevaluate sub placement and setup. I suspect that your amp is not the culprit.   
Integrated Amplifier for Sonus Faber Guarneri Evolution
Another vote for McIntosh. Consider an MA352. 200wpc into 8 ohms, vacuum tube pre with SS power. Can’t imagine how @rsf507 heard a lack of dynamics and body from any MAC amp.   
Cartridge suggestions for my rig
I noticed several references to price in your OP. I would suggest NOT basing any such decisions with price as a measure of quality. Double or triple the price doesn’t equate to quality or performance…IMHO. Many here will disagree. But there seems ... 
Service After the Sale
Similar experience with Denefrips. I recently did a firmware update and had a few questions afterward. Each email received a thoughtful response within a day or two at most. It’s clear they recognize the importance of CS. Perhaps they understand t... 
? about Smoking Power Amp
Good advice above. Replace that $150 amp with another identical one.   
Amplifier and Speaker A/B switcher
Exactly. There are many nice integrateds that have A/B switches. I’ve always felt that’s the best way to assess speaker SQ. At least for me, my “SQ” memory is very short. The time it takes to swap cables would be too long. Assuming both sets of sp...