I have heard a few great demos of B&W in-wall speakers...that would be more secure if you could get the work done at the school...if not, B&W also has a range of wall mount specific speakers...here are a couple of links:

http://www.bwspeakers.com/index.cfm?fuse...Submit=Continue

http://www.bwspeakers.com/index.cfm?fuse...Submit=Continue

Personally, I own a number of Energy speakers and they also make an affordable in wall speaker:

http://www.energy-speakers.com/custom_products/eas-65.html

Best of luck!