>I have two great rooms that may have a dozen active devices at any moment.

If any of them are stationary, or mostly stationary, you might just want to run an ethernet cable. Even long ones are dirt cheap from Monoprice. For instance, I wired my iMac, my girlfriend's iMac, and leave a wire at our kitchen table, where laptops are most likely to be used, for about $12 shipped.

Transferring video files between machines is now fast, and we don't have interference from neighboring networks (or vice-versa). Ethernet also makes using distributed processing using Compressor (http://documentation.apple.com/en/compressor/usermanual/inde...) easy.