I was going to post a new thread to ask this question, but this seems like a pretty good place to try... I'm going to get a 500gb HDD (well, I'll end up with 2 or 3 or 4 500gb drives eventually, but one for now) to hold videos for streaming to an XBox360, a TiVo/network attached PC, maybe an AppleTV if I ever get one, (wouldn't it be cool of you could stream video to an iPod touch?) etc etc.
Essentially, it'll be an iTunes library disk. I'm figuring a good USB drive would work fine (say a LaCie by Porsche) and save me like $50, which is an extra gig of RAM. Anyone have any thoughts?