I am about to buy a new Mac Mini. I want to use it for high-end photo editing. I plan to have all my images on external drives, and just the OS and my image -editing programmes and Firefox on the Mac. I'm going to get one with the i7 processor, and 16GB RAM, and EITHER a 256GB SSD or a 1TB Fusion drive. That is my dilemma. I need to know which of those two choices is most reliable, and which is the fastest. So if anyone can help I shall be very pleased. Thanks.