Along with the case, backpack and usb 3.0 external hdd, I also picked up the DVI-to-TB adapter for one of my external monitors and I also got the ethernet adapter just incase the wifi is subpar.
I already have a bag, so I picked up a 1.5TB Seagate GoFlex drive and the Thunderbolt adapter to use for additional storage. I also picked up the external SuperDrive (because I have some software that has to be installed from a disc - only updates are available online), and ordered the Thunderbolt - Firewire 800 adapter once it was available.