I am buying a used MBP (Model No. A1278 (EMC 2326*) I was wandering if I could replace the 160g HD with this one. (Hitachi 0S03339 2.5" Mobile Hard Drive - 750GB, SATA, 7200, 16MB) Or is there a better HD to replace it with. I would like something with a little more capacity. And possibly upgrade the ram. Thanks for any advise.