Tips & Advice: TFT-LCD vs. LED pc monitors?

This is the case. I am working as a photo and video editor, currently on the Samsung Syncmaster 205BW tft-lcd monitor. I notice it looses brightness and colours start to fade a little and while 20.1” was a big step up from when I first got it, I could really use some extra space for Full HD editing and higher resolution pictures.

When searching for 24”, Full HD monitors with the same VESA mount as my current monitor (75×75). I came up with, yet again, a few Samsung monitors. Best ones? The Samsung Syncmaster B2440M and the Samsung Syncmaster BX2440. The main differences? The first is an LCD screen with 300cd/m² and the second an LED screen with 250cd/m².

My question for you. Is the decrease in brightness noticeable or even possible problematic. Would it be worth to have an LED monitor, I only know the LED MacBook screens which I love. I’m in a real dilemma. Is LED going to make a big difference? Is the LCD’s brightness going to make a big difference? Tips and advice please.