Unless you are hellbent on getting 48+ inch HDTV, I strongly recommend Mirai DTL-642E500 (42" inch LCD, Full HD through HDMI)
http://www.cheaptv.org.uk/mirai-dtl-642 ... -lcd-hdtv/ (I'm sorry but I don't know where to get one in US, as I live in Finland and Google keeps throwing .fi and .co.uk links at me

)
I bought one last weekend and I've been very satisfied. It's cheap, has long warranty (3 years) and really the only two reasons it's cheap is because the standard version only comes with analog tuner and it's not a big brand TV (Sony/Samsung etc). It has 6,5 millisecond response time, when most HD Ready and Full HD TVs on the market have 8 millisecond.