I'm looking to buy an portable external hard drive for backups. I was planning on paying a little extra for the firewire, and both Seagate and Western Digital both came out with "Mac" externals with Firewire and aluminum casings. Now that the new MacBooks don't have Firewire, do y'all think it's worth the extra money for those drives? I liked that it was faster and that I only needed one plug. With my USB drive now, I need two USB ports, one for data and one for power. I have an older MacBook now, but may be upgrading in the future (depending on me getting a new job or not).