I was thinking about the fusion drive. I got the 1 TB version, and with the 32 GB of ram installed, there's not so much I can do to improve performance. But in let's say 2 years, I get an external thunderbolt 2x512 GB SSD in RAID0 (in two years, that's hopefully a $150 deal), is it possible to fuse three drives into one fusion drive? And does OSX realize which SSD is the fastest, and therefore moves the OS to the external drives? What do you think? Edit: I've done some research, and no - not doable. Too bad.