Hi, I am curious what SSD external HD did you use to make your own Fusion drive? Did you all go with the 256GB or 480? or 512GB? or even the 1 TB Verison SSD for $999? I am interested in installing the 1TB SSD Lacie for $999. I already have the 256 GB but it is not large enough for me. Fills up too fast. The 1 TB is the proper size for me with the Video work I do. Has anyone hooked up larger than 480 GB to their new iMac making their own Fusion Drive for those of you who did not opt in for the Fusion drive in the first place. Let me know the Brand you used and the size you chose at the minimum.