o to best buy and get a 160gig for 40 bucks, or whatever the ridiculously low price is. then sell your 2 old drives on ebay and make that 40 bucks back. you could get a sata, but then your dishing out a little more cash, and you wont notice a performance boost at all. no need to upgrade your psu if you toss those old drives out and get a single drive. plus, your computer will be quieter also. capacity doesnt have any affect on performance. just get drive from best buy. dont buy a used or white label drive online. spend the 10 bucks for a new drive.