is my room small for a pair of B&W 802's

The room you mention is a tight squeeze for the 802D. If the room is treated properly you should be able to squeeze them in. They need power and lots of it to control the bass which is quite overwhelming to begin with. Personally I was very happy with Ayre amps with my old 803D but I know people using B&W 802D that are very happy with McIntosh and Krell.

However, given that you're moving to an even smaller room I would recommend you look elsewhere for speakers that are more comfortable in smaller enclosures. Of course, you'll have to treat that room as well.

The room is wood framed with sheet rock the ceiling is 9 1/2 feet tall

You might need some EQ to flatton out the bass response with that size room.

Your room dimensions are sufficient to handle N-802's, perhaps a bit large if you are looking at the old matrix 802's. Classe mono 400's are probably overkill unless you like techno music at 100+ db.

If you haven't bought them, look at other speakers to compare cost to value. Our american dollar is worthless, and therefore British imports are VERY expensive for what you get. By all means, if the B&W's are your choice stick with it, however, be sure that competing brands have been auditioned and rejected. Don't worry about the room size. It sounds as though you have enough power. It will take careful setup and room treatment, but that should not be your issue at the moment. Be sure B&W is where you want to head.