I have a Macbook Pro 3.1 (2.4 Ghz Santa Rosa model from late 2007) that I purchased refurbished. Everything runs fine on it but I'm feeling the performance hit from not having a 7200 RPM drive, plus I'd like to have something a bit bigger then 160GB. They didn't give me any upgrade options on the refurb. I know that Apple doesn't consider replacing the internal HDD as something a user could do, so I'm pretty sure it would void the warranty (which wouldn't be good, as I have Apple Care good until Mar 2011) so how much would they charge to put say...250 or 320GB 7200 RPM drive? Or could I somehow do it and not void the warranty? Thanks.