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Your bottleneck is not going to be the drive speed so RAID would only benefit wired LAN computers. Even with a good wireless N signal, the speeds will not be very reliable. An external antenna will help if you have a larger house. Also dual-radio, dual-band routers can provide enough speed to stream video. Linux and OS X both support Windows Networking so there should be no problem there. Gigabit ethernet is available on most current PCs so it might be worthwhile to hard-wire all your computers in. I wouldn't bother with cat6 cables unless you are running lots of wire through your house.
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