I second Raaza's question; and I'll add my own. I want to upgrade the HD (I Think) to the 500GB 7200 Drive you linked to, but I'm concerned about heat and noise issues. is there a huge performance boost between the offered 500 GB 5400 Drive? I am planing on buying the 1400 version so I get the 4GB RAM and the faster processor to start with. Is that worth the price?