You will want to avoid a PLASMA screen TV if you live at high altitudes (at least anything much higher than sea level). Your TV will wear out much faster.
Here is an article on this very topic:
http://www.plasmatvbuyingguide.com/p...-altitude.html
Personally, I think that the statistics are too optimistic, and that you're going to have problems above 1,500 feet, let alone 5,000 or 6,000 feet, but I present this article as the best-case scenario.