Depends on the environment they are moving to.
Things to consider:
Environmental hazards ( grease, smoke, )
How are they connected to the system?
Technically, you could go with the low of the low end, like sylvania, or Best Buy's home brand and they should be very readable at native resolution. However, you also need to consider your cost of one should fail. Lost business? Ease of replacement? Weight?
Should they be away from the grease smoke and from people's hands, I'd probably recommend a 720 resolution 32in LCD tv. Any higher resolution and you run into readability issues if you haven't worked that out yet.
If you are putting these in a hostile environment, they make industrial TVs for quite a bit more.