I have a Macbook Pro (2016, 256, 8GB). I'm thinking of supplementing it with a second hand iMac for my office space at work, preferably a 27 inch but also looking at 21. I'm unsure how far back it makes sense to go when buying used. So far, I've kept my macbooks for a maximum of 4 years before upgrading. Usage: I usually run about 10+ apps at the time: note taking app, calendar, two mail programs, pdf reader/editor, word, powerpoint, bookends, skype, omnioutliner, tidal, task manager, keyboard maestro. Photo editing can stay at the MPB. Need to play audio and video files for work, but no editing. Several of the second hand ones I've seen have a 1920x1080 screen. Not sure how I'd feel about that after being used to retina. So far, I've been looking at second hand options dating back to 2013. Most of them have a 'regular' 1TB hard drive. I've always used SSD so not sure how much of a difference to expect in speed. Here are some examples of machines I've seen (I'm in Norway, have converted the local prices): - iMac 27", late 2013, 3,4 GHz intel core i5, 26GB RAM, 1TB. - USD 1339 - iMac 21", late 2017, 2,3 GHz, 8GB ram, 1TB, 1920x1080. - USD 1148 - iMac 21", late 2013, 2,7 Ghz, 8 GB, 1TB. - USD 702 Are the 2013 models too old to bother with?