I currently have a Mid-2010 17" MBP with two 512 GB SSD drives. The primary drive houses my OS, Applications, and general documents. I have about 220 GB used. I will be pairing down the files when I migrate to the new laptop. The second drive is dedicated to my photography files (Lightroom and Aperture databases and all photo files). I have about 230 GB used. I should probably go through and delete a bunch of the "crap" photos, but that may not clear much at all. I am looking to upgrade to a 13" rMBP and was wondering if I should get the 512GB model and use one of the 512 drives in an external enclosure, or bite the bullet and get the 1 TB internal drive and not worry about the external drive. I will have the money when I decide to purchase, but saving any amount of money is always a good thing.