Only difference between a TV and a monitor is that a TV has image processing and a tuner. Also, when you increase in size, with TV's, the resolution usually stays the same, so a 40" TV will have the same resolution as a 24" monitor, and a 30" monitor will have a much larger res than a 30" TV.
Of course, this is only useful if you use it for actual PC work or close up. Considering you want to do spreadsheets and databases on it, I can say now that a TV is not what you want. Go for monitors.
As for LED backlighting, nice, but a better panel is much more useful. For example, the G2410 is a 24" LED backlit monitor, but the NEC 24WMGX3 is a much better monitor even though it's CCFL lit.
Basically LED backlighting is much more efficient than CCFL backlighting, and can enhance or reduce the lighting in different places, rather than having to dim the entire screen like CCFL, which means you can get brighter whites and darker blacks on the screen at the same time, which, to be honest, won't happen a lot. You'll almost never have pure bright white and very dark black on the screen at the same time.
If you still want that LED backlighting, you can get triple G2410's and still be in budget.
I'm assuming you have about £1000-£1200 if you were looking at the Samsung 40" LED TV's, you could buy:
Three 24WMGX3's. Fantastic monitors, 24", PVA panel, brilliant for gaming and movies, but you don't get a TH2GO, so you can't play many games in triple screen.
OR
Three other 24" monitors and a TH2GO. You could get 3 G2410's, meaning you get the LED backlighting, AND you will be able to play ANY game (that is compatible) in triple screen.
The only advantage I can see to getting the TV, is the larger physical size, which would be nice for sitting back and watching a movie.
Bear in mind that this LED technology you see about the Samsung TV, is not a new display type. It's still LCD, don't get it confused with OLED screens. OLED screens use tiny organic LED's as each pixel, which need no backlighting, produce incredible colour and can be made very thin. They are expensive, and can currently only be found in some phone screens and a £1500 11" screen, or £500-600 7" photo frames. LED backlighting is different. It's simply a new way of lighting it up, like energy saving bulbs.