I think the room will be fine. My room is 15' wide, and the 802Ds do quite well in it.
BTW, I am running the 802Ds with Classe CA-M400s. The CA-M400s are a good blend of sweet highs and controlled bass.
The MACs will be warmer. The Pass Labs is a good choice too. A friend had the 350.5 hooked up to some 802Ds, and it sounded very nice.
All the amps suggested are good matches. It comes down to personal preference at this point.
Darrell