Well, I've just got myself the Dell U2913WM. In a word - superb.
I've had a dell 24" for about 5 years (2407WFP) and had a daft upgrade itch recently after seeing the cheapish 27 inch 2560x1440 models knocking around. I ordered the DGM 27 inch from here last week, but it had a number of faults (including awful backlight bleed and clouding) - so I sent it back and picked up the Dell 29 from elsewhere instead.
Now running my old Dell 24 in portrait mode alongside this widescreen monster. It really is a cracking set up for my needs (gaming, photo and video editing).
Everything about the Dell is great - colour rendition (v important for me), no backlight bleed, no dead pixels (and a Dell guarantee to repalce if there are), not PWM backlit so no flicker and less eye strain), build quality is nice, screen and chassis design look premium, OSD is lovely. I even quite like the software that comes with it that lets you set up a few auto preset settings for different programs, game mode for gaming etc.
From the reviews I've read the panel is the same in both the LG and the Dell (ie it's LG), so given they are almost the same price I'd go with looks and which features you need. The fact the Dell has a height adjustable stand really swung it for me over the LG.
I really don't know why there isn't more excitement about the super wide 29 inchers. For gaming the immersion is brilliant, and the performance hit on your GPU is way less than 2560x1440 gaming, which was too much for my 2 670's in SLI in several games.
Very quick and dirty pic of my set up now. Dell 29 inch on the left, Dell 24 (1920x1200) in portrait mode on the right...
		
		
	
	
Ask me anything you want to know about the Dell screen if you like...