The U2711 needs dual link DVI to go to its native resolution. This doesn't mean that you need to use two DVI cables/ports, just a cable that uses all the DVI pins. The monitor includes the correct cable, and pretty much all video cards with DVI out have dual-link capable connectors. You'll need a somewhat upper range video card anyway to run more modern games at that resolution, and those have dual link guaranteed. Scaling of 16:9 (1080p) material will also look better on a U2711 since it's also 16:9.
That being said, if you're also running your PC through the HDMI input, then yea, you're going to be limited to 1920x1200 as far as I know so it would be pointless to get the U2711. But with the output options computers give you, you can easily run surround sound audio to your receiver and the video signal via dual link DVI to the monitor.
Most computer monitors don't run with the newer 1.4 HDMI spec that supports the higher bandwidth required. See, high def TV is no more than 1920x1080 at best, and most cable/sat/broadcast TV is actually 720p upscaled to 1080i/p. Even most video games on consoles are rendered at 720p or less as the hardware can't push even that resolution. It's less of an issue of graphics power, and more an issue of bandwidth in the cable. A dual link DVI cable can carry more data than an older HDMI cable. Display port trounces both of them handily.
EDIT: Sorry, forgot to sum up. Basically, if you were looking at the U2711 and can afford it, go for it. Unless you are going to run you computer over HDMI no matter what or your computer can't play games at the monitors native resolution, there's no reason NOT to get an U2711 for your uses.