I really like Samsung products, my monitor and current lcd are both Samsung, so to you, I'd have to recommend this 57 Samsung LCD 
http://www.samsung.com/us/consumer/d...=LNT5781FX/XAA which they claim to have solved the issues of true black, I never seen one in person to tell though.
In plasma, Samsung sells a 63 incher - 
http://www.samsung.com/us/consumer/d...d=FPT6374X/XAA which sell for $4,900-$5,500.