Dell has a monitor for almost any size that you are after, and has been one of the manufacturers with a 30″ panel available for a long time. There have been a few revisions of it, but the model U3011 has been around for three years now until finally being replaced by the Dell U3014 this year. The Dell U3014 isn’t just a 30″, 2560×1600 display, but is one of the first displays on the market that utilized a G-B LED backlighting system. Typical LED backlighting systems only manage to achieve the sRGB gamut at best, but these new G-B LED systems can do the full AdobeRGB gamut, allowing professionals to be able to buy displays that use non-CCFL backlighting systems again.
Additionally, it has a DisplayPort output that supports MST, letting you daisy-chain another display off it provided you have a supported graphics card. It also has color calibration software included for free (you need to buy the sensor), as well as a very nice input system that has both MiniDP and DisplayPort inputs, so you can use a single MiniDP to DisplayPort cable to connect to any system instead of needing multiple cables around. Dell really has packed a lot into this package, which shows in the $1,500 price as well.
I go into depth with the Dell U3014 at AnandTech today, with a review that comes close to 8,000 words and tries to leave no feature untested, and no question unanswered. There is a lot to cover with the Dell U3014, and in the end the performance does back up the price a good deal, but it is worth reading to see if the monitor works for you, or if there are other issues that might make a different display a better choice still.