On day 1 I ordered my mid-range with i7 2.6 and 4GB to replace later... and I put in a Fusion drive. I am starting to regret this a bit. While I am not excited about opening up my mac and getting kits to disassemble, I have concerns about the long-term health of the fusion drive, and the lack of control I think I might have (and hate). My thoughts now are: should I change my order to just the 256 internal SSD drive (and overpay $100 to not have to open it) and then just get an external 1-2TB as USB3 or TB? And if I wanted to do this, does apples store let me do that on an already placed order or do I have to hop back to the end of the line, cancel it and make a new one?