So, here's the thing. I'm a student and I used hp laptop for all of my work. Unfortunately for me, the motherboard died and I ended up with using an old powerbook with os x leopard which I really like to work on. But I'm afraid I need something newer because of the advantages of os x lion and icloud, and basically having a machine which is up to date in software sense. Since I'm pretty low on budget these days (bought a new car, paying rent and so on) and I got around $600 to spend. So, after doing some research on the Internet I ended up with having a little problem with choosing what to buy. White MacBook C2D 2.0 gHZ , MacBook air 2009 1.86 geforce 9400m or pre-unibody MacBook pro 15''. I'm not going to use it for any "hard work", just for surfing the web, writing papers, just sometimes for playing some older games such as gta San Andreas or call of duty 2. I would appreciate any kind of help and sorry for my bad english .