The Teddy 12/4 looks to be a perfect fit for the MC200, the DC cable is already set with the correct DC connector so no soldering required. Also the correct voltage and being regulated it has 4A capacity but will probably run much lower normally. The MC200 has a 3A switched mode PSU so there is a little nice oversized margin as well.

I've not delved at all into high-quality linear regulated PSU's (wall wart replacements) so there might be much more alternatives out there.
But the first step to a performance increase for the MC200 seem atleast with common thinking be to put a high-quality linear regulated PSU instead of the wall-wart switched "bump".