Tube amplifier upgrade suggestions welcome.

Use your M-F for a pre-amp and get a pair of Quicksilver Mid Monos. You will be very happy.

Mid Mono Amplifier – Quicksilver Audio

shawn, the seller seems to have provided good CU pics of the amp. It’s very clean and he states it’s only 3 years old. Not much wear happens in that short amount of time except for tube life.

The questions I have are answered on the Music Reference website including:

Tube Complement:
2 Matched Pair 6BQ5/EL84;
2-12AX7

"Each unit is hand wired with point-to-point wiring."

EL84 is a very smooth, sweet sounding power tube. 12AX7’s are the input tubes and are widely used and not too expensive.
P to P wiring is preferred over using circuit boards.

I would ask how many hours are on the tubes, will they need replacing soon, is there a user manual, is there any transformer hum? (Some tube amps have a low-level hum that does not come through the speakers. It’s in their design). Ask if you can speak on the phone since it’s your first tube amp.
It’s a good price, probably because of the chip in the wood body. Definitely not a deal breaker.

I see your m2si has preamp outputs, so you're ok with just about any tube power amp.

I’d look at a second hand Leben integrated

I won't mention Prima Luna products - it starts an infantile chest puffing, pissing contest and your thread will be deleted. 

OK, so the Music Reference RM-10 sure looks like what might like and checks out so far, but is $1800 a good price, including shipping?