I am looking to go from a MBP to MBA 2012. My issue is I have a firewire HDD as well as an external monitor. Most of the time I don't use them at the same time, but for the times I do, how can I? There is only one ThunderBolt port. I know they have those TB port expansions but they are super expensive. Any ideas other than just disconnecting the display when I want to use my external HDD?