Ok, This is my first time I am going to buy a hard drive for a laptop. I see they are a lot more cheaper than external ones on amazon. Yet i have no experience. Can any one tell me what brand or specs I should be looking for? I am running macbook late 2008 model. anything i should pay attention too? some stuff is hard to believe, 500gb for $50. My hard drive is 160GB only! such a nice upgrade! most important to me is reliability!