IMHO if you want anything over 37" then you should go for a plasma, better viewing angles and deeper blacks.
Its all a matter of opinion, but if it was my cash then go for a Panasonic PX 600/PX 60. Panny also giving 5 years warranty!
I took a long time deciding what TV to buy and after reading up the Panny won.
I was going for a 37 LG lcd, but having seen my parents useless 32 Lg lcd TV I'm kind glad I didn't.
Go to
www.avforums.com and browse the forums, get some good info that may help you decide.