I have a mid-2013 13" MacBook Air with a 1.7 GHz i7 processor, 4 GB RAM, and 512 GB SSD. It runs perfectly well but I have recently found that I need much more screen real estate. Meanwhile, rather than releasing new iMacs on 10/27, Apple decided to release new MacBook pros with a little touchscreen function bar, which I absolute do not need right now. My question is this: Should I spring for one of the new LG 4K or 5K monitors, or will they even WORK with my 3-year-old MacBook Air? I'm thinking EVENTUALLY, I'll need to upgrade to a MacBook Pro, and when the time comes, I'd like my new big screen monitor to be compatible with whichever future MacBook Pro I choose to get. But at the same time, I will need it to work with my current MacBook Air and my wife's mid-2013 11 inch MacBook Air. Any thoughts? Should I just wait until 2017 (or maybe 2018) to get a new iMac? Should I spring for the "new" iMac now, even though it's over a year old and hasn't gone down in price yet? Or is there a monitor I can buy that will satisfy my needs today AND be forward compatible with whichever laptop I may own in the next few years?