Ask yourself what features and benefits that you need and make an intelligent based on your own.
If you just need a 55" flat panel LCD with 120 Hz, I would recommend the Samsung LN55C630 that you can catch it on sale between $1,299.00 to $1,499.00. The Samsung LN series use the old CCF light so it's heavy and a bit thicker than the LCD/LED. It does not matter much if you will not hang them on the wall.
If you need a LCD/LED that provides you 1.5" thick and can be hanged ( not wall bracket-mount) on the wall with Samsung cable mount then go with the UN55 series. The benefits are 40% more effiency ( less electric bill), higher contrast ratio, can be hanged flat against the wall without any bulky wall-mount. Of course, you will have to pay some more $$$ for these attractive benefits.
Panasonics make some awesome Plasma with THX certified and wifi ready....Do you need Internet Apps or do you not ?
Mits has some nice flat panel with blu tooth capacity and nice array of internal speakers. Will you be using the internal speakers at all or will you not?
3D Tv is here to stay that why the price on these LCDs and LCD/LEDs price drops like fly. You do not want 3D, this is the time to catch some of the good sell.
Happy shopping.