iMac 27-inch late 2013 (3.5 GHz quad-core i7, 32 GB RAM, NVIDIA GTX 780M 4GB). Fantastic computer in excellent condition.
When it was new, this computer was the top-of-the-line iMac, and it cost me over $4k. I would keep this computer for ten more years were it not for the fact that I am downsizing my living situation and switching to a laptop. It has worked perfectly for every task I have demanded of it over the years, including video editing and gaming. Starts up fast. Again, no problems whatsoever. Comes with keyboard and trackpad (pictured).