I have been using a 32" FHD TV with my PC from a distance 3-4 feet for last 4 years.FYI, my setup is 27" Dell U2711 + 32" Samsung TV. This is going to be replacement for the TV and yeah, distance has also increased to about 5.5 - 6 feet since I moved into my new flat.
Input lag may not be too big a concern since I am not into any online competitive gaming. I am only into single player games and a means of recreation. In any case, even as far as monitors are concerned, I have been using IPS displays only and they too have comparatively high lag though it may not be as bad as a TV.[DOUBLEPOST=1505021664][/DOUBLEPOST]
I would consider a brand like Vu if the product is good. In fact, I was originally considering LeEco, but dropped the thought because of the state that company is in.