whats the best external hd I can get (that is cheap but good) with about 120gb or higher that will be compatible with macs and pc's...my pc just got a trojan that macaffe can't delete and I had to back everything up onto my mac and I'd like to get an external hd so I don't kill my mac...any suggestions? edit: so by formating it to fat32, it won't matter what hd I get really? Like I'm very computer literate but that's with pc's so when it comes to the mac side its kinda like...uhhhh...you know? Basically if I get any external hd, I'll be fine??