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I had 20/20 vision up till age seven; at that time, I began to have trouble reading what was on the schoolroom chalkboards. Apparently I read so much and so close to my eyes that, as I grew, my eyes adjusted to the constant close-up work by growing longer to make it easier to focus close. Just my theory.
But anyway, for non-personal tv, six feet [or a bit less than 2 meters, for the Système Internationale inclined] would be reasonably unlikely to cause gradually increasing near-sightedness amongst the still growing, so even less should be okay for somebody who is already adult size, though it might tend to induce eye fatigue during long viewing periods. Such as playing WipEout for hours and hours. :D
So I'd recommend a 32 inch widescreen as a minimum for the non-nearsighted, just so you could sit back well away from it and still have the pleasure of the image covering a wide field of view, and the greater immersion in the game that gives. After that it's just figuring out which big screen has the least lag, which other people here know a lot more about than I do. :eek
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If it's of any help, this is one of the few tv review sites I know of that include input lag in their reviews.
http://www.hdtvtest.co.uk/
