Before you give up on the M700s consider my experience with my LA4 and M700s which are in my end game system.
I have found the M700s to be very finicky and only perform best if they are getting the very best power. Otherwise they will sound thin/shrill. It is not the amps fault.
1. At first I plugged them into my Furman Elite 15PFi amplifier outlets which have current reserves for audio peaks. They were pushing the Furman past its performance specs and the amps let me know.
2. Next I plugged the amps into a PS Audio Ultimate Outlet, no longer available, with a Signal Cable Magic Power Cord and lived with it for many months even though it was pushing the UO to the limits of its performance. I was very happy the way this sounded not knowing better awaited.
3. When I realized I had an extra Audio Quest IEC 3US Power Cable Adapter, $40, I substituted it for the UO. Everything relaxed and beautiful tonality emerged along with all the sonic describers being enhanced.
Let me describe my setup as you may find something in the "thrifty" department to try:
1. Whole house surge protector > PS Audio wall outlet>
Signal Cable > AQ adapter > SC > M700 > MIT 2 Biwire > Carver AL III+ speakers.
2. Same wall outlet > SC > Furman > LA4 > Kimber Kable Hero XLR > M700.
The sound is sweet and transparent and wide and deep and Oh so involving.
Don't forget mechanical isolation under the M700s. I use 6 hockey pucks in stacks of 2 sitting on the chassis of each amp!