Didn't realize the input lag on my 4K HDTV was so good (13.5ms). When I finally pick up an OSSC, that means I'll be doing my classic games with 1 frame of input lag, which is good enough to not make space for my Trinitron (for now.)
Vizio D50u-D1. It's discontinued, I bought it a year or two ago refurbed from Amazon on the cheap specifically for the input lag (I used to play a lot of Rock Band & Street Fighter.)
What does suck is that only one of the HDMI inputs has that low of input lag. If I want more than one game system, I'll need to get an external HDMI switcher. :\