I'm getting a new "trashcan" Mac Pro, and am trying to decide which external hard drive to get. I am looking at two 3TB drives from LaCie and Seagate: https://www.lacie.com/us/products/product.htm?id=10600 http://m.seagate.com/external-hard-drives/desktop-hard-drives/backup-plus-desk/ The drive will be used for time machine backups as well as music/movie/picture/general storage to supplement the internal 256gb I have. My questions are: Are these drives good choices for a Mac Pro companion? What is causing the large price difference between the two, or is it just the addition of thunderbolt? Will I miss the thunderbolt if I do the seagate? (From what I can tell its no faster than USB 3.0 for these drives...) I am open to suggestions for other drives as well. Thanks!