I'm looking to buy an extra hard drive for my system to install a second copy of Windows and Office XP which will serve as a backup in case I mess up my raid array and will keep copies of all my mp3s and important files. Since it's my backup I don't need lightning fast speed or large capacity but I want to get the most bang for the buck possible. I don't really want to spend more than 100 bucks. What do you think my best bets are???