I personally wouldn't recommend the Dell 3007 though. I find mine buzzes (which drives me up the wall). I get weird flashes once in a while which could be either the monitor or graphics card. I don't like the way it relies so heavily on the USB connection to the PC for various controls and other functions - I've had it get into a state in which the power button wouldn't work and I had to reboot the PC to regain control of the monitor. All in all very poor for a £1000 monitor.
Don't get me wrong, I'm sold on the 30" business, just not the Dell 3007.
I have 20" dell and I have a problem with the power as well, though it may be different.
Mine basically gets into a standby mode and won't wake up sometimes. I have to turn off power to PC and then turn it back on to make it wake up.
It is incredibly annoying, but it is my motherboards fault as far as I can tell. I worked fine before I got the new motherboard, and then did it with 3 different graphics cards consistently. I emailed Asus tech support about it and they did not even bother to respond...