There is an amp that should be seriously considered with the MS-5's. As they say, synergy between amps and speakers is everything. Check out the Gamut D-200 mkII, not the mkIII. In particular, this will be a good match in the bass region. Then, together, you will have wonderful soundstaging, imaging, and depth. There is plenty of power for your room size. One can be purchased on the 'Gon for $2200, leaving you with more $$ for a pre and source. See a review at: www.acousticimage.com/GoldenEarReview.html
Have fun with your search!
Have fun with your search!