I'm in Canada so the costs are higher here. I need to spend close to 2000$ on another apple iMac refurbished. I use Lightroom almost 100% of the time and am an amateur picture taker simply getting once again into it in the wake of having another child. The PC will essentially be for photograph altering. I'm attempting to choose if the retina 4K merits the overhaul? I can get a refurbished 2013 27" i5, 1TB 7200rpm, Nvidia illustrations with 16Gb smash, 3ghz for 1989$ or I can do new 21.5" without retina 4K with i5, 1TB combination drive, 16Gb slam, 2.8 GHz 2000$ Is the screen still a retina screen on the 2013 iMac? I know it's not 4 or 5K but rather that doesn't make any difference to me. Any assistance would be greatly valued to track down the best framework. Much obliged. Is it with getting 16bg from Apple or redesigning myself from the 8GB? Do I at any point need 16GB?