Hello, Im buying a new laptop for University next week, and I'm in a pickle. I really want a MacBook, (mainly due to the price) but I would def. like a memory upgrade. I'm thinking that I will upgrade to 200GB, however I noticed that by doing this, you're also lowering the RPM. (From 5400 RPM to 4200 RPM) Question - is this something that's actually noticeable? On the same note, would you recommending upgrading the memory in a MacBook and sacrificing the RPM, or changing and going for the MacBook Pro and getting decent RPM with decent memory? Many thanks!