Please post the prices of each set.
Regarding LCD vs LED-LCD:
Are you sure none of the LED-LCD's you looked at weren't full array LED back-lit? Those have a clear advantage over CCFL-LCD and LED edge-lit LCD. They cost quote a bit more.
Did you compare menu settings? LED-LCD's are marketed as being slightly brighter (higher dynamic contrast, which is more BS marketing gimmick, and in reality (your TV room) it's really nothing), make sure the salesmen aren't taking advantage of this by running the LED-LCD's on "torch mode" do make unknowing customers pay more for them. Remember that your TV room doesn't have shop lighting, so again there would be little or no difference as you would not need to run the TV as bright as a a shop would.
For the record, I'd get this from Samsung, or look into Panasonic plasma.
Samsung PS50C7000 , 3D plasma TV with tuner , 36.8mm ultra slim , network ready ( wifi optional ) , with light control for energy saving , BD wise , anynet+ , HyperReal picture Engine , ToC , platninum black , 50" wide plasma display with swivel stand + integrated DVB-T tuner, 1080P Full HD , 2 x 10w SRS TruSurround XT speaker , with Movie Plus , Ultra FilterBright , DNIe , PIP , 1920x1080 ; brightness- 1000cd/m2 ; DC contrast ratio- 3000000:1 - d-sub+ 4xHDMi+ 2x component+ RCA+ usb+ UTP , 400x400mm vesa-wall mountable - 1 year warranty
↑ should be much cheaper than the 55" LED-LCD.