LED backlights aren't necessarily better. The Dell U2311h uses CCFL and not only does it have LED-like power consumption when calibrated properly (less than 30W, maybe around 40W when uncalibrated) but it has better color gamut as well.
LEDs are great if you have RGBLED to get ultra high color gamut or if you want a TV with dynamic backlighting. For a computer monitor though, at least at this point, it shouldn't be a deal breaker in your purchase.