Hello all. Ive decided to go down the imac route now and have gone for 21.5" with i7, 16gb ram. The final decision to make is regarding the hard drive. Do I go for fusion or 256ssd? The 256 will get taken up fairly quickly I feel but want to future proof the mac. I have an external hdd drive already or I can always purchase more ssd space and connect via usb at a later date. Which do you recommend and if I went with fusion could I 'fuse' the external ssd to the internal fusion drive? Any help is much appreciated.