I have only had my MacBook Pro 13.3 for a couple months but from day one I really wanted a bigger hard drive, but didn't feel like going through the trouble or spending the extra at the time to custom order the 250gb HD. So I currently have the 160gb HD. With my Snow Lep disc I am tempted to upgrade to a 320 gb hard drive- special on Newegg for $69. Other than voiding my warranty - anyone have any advice?