I give you some choices. Of all the desktop amps, the best performing and least expensive of them all...a vintage receiver, period. Hands down, no contest. The old receivers from the 70's have some legitimate power and refinement. But they are not for everyone. The often need simple TLC to get back to good working order, but they can sometimes need much more...just depends on what your local CL might turn up. You could end up with a nice Pioneer sx receiver for $50 bucks that would rock the socks off the MD.
Depending on your budget ( you should always list your budget when asking for suggestions ) consider the following:
*Audio GD (they all have good clean power)
There is an entire thread dedicated to amp pairings with the MD. Just check under the full sized amp section here.
Thanks! I'll make sure to check out that other thread.