I have really wanting to jump into a Mac...i would like to get a macbook of some sort, but they are expensive. I was thinking that since i have a monitor mouse and keyboard i could just get the mini. Its cheaper and has similar specs to the macbook. My question is, when you start spec'ing one out it shows max ram to be 2gb and max hdd to be 160gb. Why couldn't i buy the base model...then upgrade using standard RAM later (or would i need mac specific ram), and a bigger hdd? Are there any space limitations within the case that would prevent me from going to a 7200rpm 500gb drive? Thanks.