For starters, how's the stock drive that comes standard with the laptop? should I even think about spending money upgrading the stock drive to a bigger capacity from the online apple store upon checkout, or should i save it for a third party install? I read somewhere that the WD 500GB scorpio blue 5400rpm beats the Seagate even though the Seagate runs at 7200rpm. True? Any mechanical drive faster than the above two (and I mean one within the reach of the typical consumer, not some new fangled prototype running at 15k rpm)?