I am a PC user buying my first macbook and need help selcting right right one. I absolutely want the 15'' screen, I think the 13'' is too small, otherwise I'd just buy a macbook. I use my computer for music, email, and office, and facebook. I want the fastest computer that will not slow down if I have powerpoint, limewire,itunes, poker, fb running at the same time. I have a lot of music, but not as many movies on my computer. I just want to know if I need the 2.4 GHz or 2.53 GHz ? Is the 2.53 a waste of $$$ for my needs, or will I need it so it doesn't slow down my computer in a year or so...? Also Will 4GB be plenty or do I need the 8GB ? And 5400 or 7200rps ? I have also been told all macbooks are the same in terms of internet speed b/c your "connection" is your internet connection and is seperate no matter what comuter you have. All your advice is certainly appreciated!