One day I will build a new PC and install XP Home. How much hard drive do I want? I am not into graphics or music so space won't be a real point, just performance. Thanks.

Hmm.. if your not doing anything on it, i think 20 gigs would be plenty. But why not get a larger one "just in case"?

You'll need roughly 20gigs just for the OS, restore points, pagefiles, etc. You'd be better off with a 40 or 80 giggs