Yep. 200 sq. ft. could be any number of shapes. 10x20 is one, but so is 13x15 or 12.5x16. Hopefully it's not a 14.142' square for standing wave concerns. Actually, 10x20 would be problematic that way too.
Anyway, 13x15 (for example) has quite a bit more breathing room than a 10x11 or 11x12.
The GoldenEar Aon 2 or 3 on stands would occupy this room size with ease and wouldn't need a sub. Some of the small footprint floorstanders could work well too, such as the Silverline Prelude or Prelude Plus, or the Focal 816V Chorus or 826V Chorus.
Of course, I also like the Magnepan offerings, and you may even have room for the new .7 over the MMG.
In fact, here's a
very favorable review from Steve Guttenberg at C-Net where he auditioned the Maggie .7s in an 11x12 (121 sq. ft.) apartment room to great success. 200 sq ft should be a breeze by comparison.
As for amps, I already mentioned that the NAD integrateds (e.g., C356BEE) are good for this application. If you go Marantz, get the PM8005 integrated. That's a nice-sounding amp and would be a good match for the room and speakers under discussion.