I am thinking to upgrade my Sony 40" Bravia LCD HDTV. What brands should I start considering? Sony, again? Samsung? Vizio? Toshiba? By the way, I want to upgrade to 55"-70" LED HDTV, but I don't want to pay more than $1500 USD (at most $1600 USD), and I'd love to have a 3D smart TV. Please, explain why you recommend one brand over another. Thanks.