Hey guys. I need som help deciding what hard drive to buy for my 4 gen MacBook. I've been researching for quite a while now and decided to ask the forums before i do the purchase. I've narrowed it down to these three. All 500G and 5400rpms Hitachi Travelstar 5K500.B Seagate Momentus 5400.6 Western Digital Scorpio Blue 500 What REALY important to me is the noise levels of these. I value noise and battery over performance. Please post your feedbacks of you ever tried any of these hard drives in your macbook. thanks!