I have 7 M200s I purchased last month for about $239 each. I got the Middle Atlantic slim 5 29U rack and the rack ears for the NHT E-1 ($25 ea.) which fit the M200s perfectly (
www.onecall.com).
They really sound fantastic but to be perfectly honest my favorite thing is how cool they look in the rack. I have them installed Left, Right, Center, spacer, Left Surround, Right Surround, spacer, Left Rear, Right Rear.
Good luck,
talismax