My current MBP has two 512 GB internal SSD drives. I am looking at getting a new rMBP and am torn between the cost of the 512GB and 1TB drives. I can use one of the 512 GB SSD (probably the one that I use for my photography files today) from my current laptop in an external enclosure if I go with the rMBP with a 512 GB drive. However, if I go with the 1TB drive, I will not need to worry about carrying around an external drive. Does anyone currently use an external drive for digital photo storage with their MBP? Any thoughts? Pros and Cons that I should take into consideration?