I'm considering making a PC for dual purposes; HTPC and NAS. I could buy each separately, but let's be honest, they're pretty overpriced. Any suggestions as to what I should load into this thing? I'm trying to keep cost down as much as possible. I know the NAS doesn't need much overhead; it's more going to come down to the network card and raid (if used), and the HTPC is going to come down to the proc and GPU-- any decent suggestions? I'm not looking for the best around, just something that's going to be able to play 12-20GB movies with digital audio while at the same time being able to serve as a file-server on a local network. Gigabit networking would be nice.