I have a June 2007 MacBook Pro with a 160gb hard drive (thanking God that I upgraded from a 120gb). However, now that I use both windows and mac, I want to have more hard drive space. I was wondering if anyone could tell me if I need to look for a specific hard drive (or recommend one to me). I'm looking for maybe 250gb, 320gb, or 500gb. Also, could I have the geek squad or genius bar do this for me?