I am going to have some extra money and I want to upgrade my laptop. The harddrive is a measly 80 gb @ 4200 rpm. It is the bottleneck of the system. My question is would it be more beneficial to get say a 100gb @ 5400 or something like 80gb @ 7200. I would like as much size as possible, but im not sure if just going to 5400 rpm is going to make the kind of difference I am looking for.