I have a 2.53 GHz 15" Unibody late-2009 MBP and I need to upgrade my internal HD, preferably to a 1TB drive. What's the best one? The names I've heard the most are WD and Seagate. Will my MBP support 1TB? Also, what is SSD and do I need it? I do run Parallels pretty frequently, so my computer does tend to get close to maximum CPU use, but I don't run a server or anything. Something that isn't loud would be good too. Thank you!