I use my computer for mostly photo editing in lightroom. Sometimes I use photoshop and do the odd video edit 4k as well. Looking at one of the new iMacs announced today and needing some advice. At this stage I am looking at the 21.5 inch iMac. Has a cash saving over the 27 inch and still has some good specs. Some questions I have: - Pay extra for i7 at 3.6hz. Seems only a little improvement over the i5 3.4ghz. Worth it? - 16GB ram seems like a good amount. To go up to 32GB is quite a big step up price wise. - Fusion drives. Can you still edit 4k footage fine with one or should I move up to 512gb ssd? I am currently running a ssd (with no GPU), so would I notice a difference with a fusion with GPU? I guess the main question is with this machine and my usage what should I prioritise to upgrade? i7, ram or ssd? I may be able to afford 2 upgrades here.