Needs a wifi card, also, because my router is in the basement. It really won't be that hard to do. The hardest part will be the construction (because I'm inexperienced.) but I think this'll be fun, and with the money I save by building it instead of buying it, I can buy games. Or possibly a Wii U. Wind Waker HD is pretty tempting...
EDIT: Nevermind, Wifi Cards are cheap. anything under 50$ doesn't concern me. I'm not building it until April. There are USB wifi adaptors, so that might be a thing I could do.
EDIT: Also, solid state drives are expensive, so that might be something to avoid to start. As for OS, I'm going with Windows 7, because it's the best for compatibility. I've already got a terabyte hard-drive, and solid state drives are awesome, but I dunno.