Knowing little about the subject of using televisions as computer displays, I turn to the internet and immediately find this page, which seems like a good starting point:

http://www.digitaltrends.com/computing/how-to-buy-the-best-hdtv-for-your-pc/

One take away from it: plasma screens are out of the running.

That page above refers to lag measurements found here:

http://www.displaylag.com/display-database/#participants-list

Presumably we don't need a 3D television, so that narrows things down a bit (3D costs a lot, and of course we have no use for the 3D features), but many TVs larger than 60" are 3D models now.

Will have to look into the 4:4:4 chroma mapping model-by-model as the selection list gets narrowed down.  The first candidate I have in mind is a Samsung UN65EH6000, but I have yet to find info about its chroma mapping.

Does a "PC Mode" (a feature of many TVs) automatically mean there is 4-4-4 Chroma-mapping, or does that vary from model to model?

What about size?  While bigger at first seems better, for a given resolution, pixel density drops as the screen size grows, which on the largest screens can become noticeable, especially when close to the screen.  I'm assuming we do not want to go much smaller than the current projector image, which is ~60"x44" (4:3 aspect ratio, ~74" diagonal), but we also don't want to go much larger, both for the pixel density effect, and the cost.  (Almost every television now has a 16:9 aspect ratio.)

Another detail - the current PC in 1-189 can have DVI out (currently using VGA, but can swap the breakout cable to a DVI version).  HDMI seems to be the dominant input type for TVs.  Every(?) recent TV has it, but may or may not have VGA or DVI inputs.  DVI-to-HDML conversion is straightforward ("just a cable to buy").

Other assumptions/considerations:

IPS vs VA for LCD screens?  (Inplane Switching is reportedly better than Vertical Alignment for monitor use (especially for text content).  I think IPS is far more common in models now, but not sure.)

We're not looking for resolutions greater than "HD" 1920x1080.