I'm after an external storage option which I can use primarily for saving Photoshop and Illustrator files to, rather than saving them to my iMac hard drive so I can transport them easily. I've found a 120GB SSD for about £140 which I'm considering as it can be used via Thunderbolt which I imagine will provide speedy reading and writing. Though I've heard SSD is better for storing things like software applications, rather than files that you'll be constantly updating, in terms of SSD lifespan. (120GB is more than sufficient for my files) There are far cheaper external HDDs out there which connect via USB 3.0, but then there is the concern of them getting bumped around a bit when transporting, and the write speed is probably going to be noticeably slower? Any advice would be much appreciated.