Best inwall speaker 4000$ pair

Joseph Audio makes some incredible in wall speakers that rival their award winning floor standers.

BG Radia might be more in your budget.

Ya, SA-500's and with this discount...

http://hifidelitystore.com/index.php?manufacturers_id=29&osCsid=d2dafe9bbbd7af5d417ea8a43ba07557

(no relation)

... enough left over for a good sub or two. Necessarily in-wall? How large is the room?

Solusaudio.com
Architectural "Diamond Reference" Series DR-ir8
by Philip R. Clements 1-602-437-4445
is the In-Wall/Ceiling successor
to the quite wonderful and long enjoyed floor-standing Clements RT-7.
Clements is a fine speaker designer whose only advertising program seems to consist of his website.