Thanks very much for the prompt and awesome response.
I basically decided on the 51 inch... Wife told me, you will spend as little as possible or else.
The great news was that even though the price diff was $400, the people at bestbuy made a mistake and did a one to one swap... So all i had to pay was 200 for 2 pairs of additional glasses as well as re extend my warranty for 4 years. Sweet.
Now all i need to do is try to sell my 4 ir 3d glasses from my old set, and the wifi dongle... Guesss ill craigslist or ebay them.
Thanks again for the help