It looks like we’re in the same situation. I am more concerned with the beamforming, signal reconstruction, etc, than the bandwidth. It can be a 100mb board, I will not be pushing the board.
Cyberbajt showed 3x3 antenna at MUM in Poland. It can be used with RB800 but also with ITX compilant motherboards. I know Atom boards are less usefull, but they are cheper than RB800.