I've decided that I'm going to get the 512gb SSD version of the iMac. Don't want a spinning HDD inside the iMac, 256g too small and 1tb too expensive. Question is, what version? Base, mid or high? Currently the most strenuous jobs I do on my 2011 27" iMac are viewing and occasionally editing pictures in Lightroom and watching (although jittery) 4k home movies. Even though I've got the full adobe CC suite (teacher discount for a year since November), I find myself only using lightroom.... However, I may edit some 4k home movies in the future using Premiere Pro and view 4k 50fps videos if I get another camera... I also want to future proof myself. Anyone had the same dilemma?