LED is overrated; the Dell 3007WFP is the superior choice.
But it's all very subjective. I actually don't even like commenting on "which monitor should I get" since all of us process visual information so differently. I did in this case simply because I went straight from the 30" Dell to the 24" ACD.
The 3007WFP was easily the worst monitor I've had on my desk in years. Between the aggressive anti-glare treatment and the wide color gamut I couldn't wait to get it off my desk. If neither of these things bothers you then you will have a vastly different opinion.