That's a pretty big room for MMGs.
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Here's another thought, particularly if your source material is strictly digital:
You might consider an HK990 integrated amp and a pair of quality subs. The HK provides a quality dac, digital x-over, and room correction, as well as a Citation derived power amp section w/ 150 wpc. I've used a similar (tho not HK brand) set-up w/MMGs and the results can be pretty stunning.
The HK offers the sub controller functionality at an (other than multi-channel AVR.... AFAIK) unmatchable +/- $1500, and a pair of SVS or Rythmik subs will cost about the same. Add your MMGs and your CD player and you'll have a pretty fantastic full range, room corrected system with a healthy dose of Maggie's planar magic thru all but the bottom 2 octaves.