I'm in the "waiting for a Mac Pro" camp and can't wait any longer. I've decided it's time to buy a computer. I'm thinking of a used iMac on Craigslist. Right now I have a 2010 Mac Pro. My wife is a pro photographer, uses lightroom and photoshop daily. Our Mac Pro is pimped out, 48gb RAM, 1tb Apple SSD, USB 3.0, 12-core. But I keep running into weird problems because the computer is 6 years old. Sierra crashed everything. Wireless mice do not work without serious lag. So I'm upgrading. These computers have been on the market for almost a full year, so I don't want to buy new. What can we expect from 2016 upgrades? Are any possible upgrades worth holding out for? Or should I start looking for a deal 2015 iMac?