Im considering getting the small model for my sister, neglecting the dvd burner and adding a much bigger hd and 2 gigs of memory. But how big a drive can the Macbook take? And is there any hardware requirements that has to be met? I saw that I can get a Seagate Momentus 5400.2 ST9120821AS 120 GB disk for about 30$ more than it costs to upgrade to a BTO 80 gig disk from applestore. This way we will end up with two drives, and I'll buy a 2,5" usb house and she can have an external storage for backup as well for birthday Ill stick to 5400 rpm due to power and heat considerations.