I hate hate hate hate running out of harddrive space. I'm going to be buying a MacBook Pro and was wondering if I should upgrade to 320gb or 500gb. I know this is a question that pretty much I can only answer but I want some feedback. For one, how much "usable space" is really on the 320gb and 500gb drive after you first boot up and after programs are installed. (I'm guessing 300 and 475 respectively). Two, I have about 50 gigs of music, 20 gigs of photos, and 15 gigs of doc's (85gb total). I'm thinking if I have 2/3rds my HD free, that will be just fine, but I don't want my machine to be slow if I ever flirt with filling my HD. I want this Mac to last between 3 and 5 years as well, I'm inclined to think that paying the extra 100 dollars and bumping it from 320 to 500 will be worth it, but I don't want to pay for space I won't use. Anyone else had this dilemma before? Any thoughts would be appreciated.