Thinking about how this may be the last version of HDD iMacs, I was assuming this would decrease the value significantly, and it would be hard to sell in 4 or 5 years. Then I started thinking that the fusion may not be such a bad idea. But now I'm wondering if the fusion, a fancy feature that we've all wondered what happens when half fails, would decrease the value even more than a HDD. What do you guys think? I really want SSD, but won't be able to afford 768GB. Do you think thunderbolt external SSD is the best boot drive option?