Is this a good high definition tv? It will be used for playing xbox 360, Playstation 3, watching dvd's, watching digital cable, and might occasionally use it as my computer monitor. http://www.bestbuy.com/site/olspage...CategoryId=pcmcat31800050030&id=1110265591659 Does anyone know the estamated life expectancy of this tv? Is Toshiba or Samsung better, or about the same when it comes to TV's Will this TV be "future proof"