You can't game on an ACD out of the box.
For a PS3 you will need an HDMI to DVI converter and an HDMI switch so you don't have to swap cables.
For an Xbox 360 Core or Premium. Forget it. It doesn't work unless you spend about $350 for a box. This is because the ACDs only take digital signals. These Xbox 360s put out analog.
For an Xbox 360 Elite, it is the same as the PS3, HDMI to DVI and a switch so you can switch between them.
Anyhow, the ACDs are not professional displays. Sorry. The backlighting is terrible. I had 3 different ones and they all bled badly. They have image persistence issues and pink case on some. They are also very slow, which for video is not a good thing.
They are beautiful displays. But not worth the money especially when just about every other display has more than one input or at least allows analog signals. They all have a scaler as well. Which is more expensive to do. So when you consider what the ACD has, one DVI-D connection and an aluminum housing. You aren't getting much for your money.
Some people, like myself enjoy a display that can do most things. The gap between P-MVA and S-IPS is closing. I recently got a 24" LG and it is beautiful. HDMI (comes with HDMI to DVI cable for your Mac), VGA, and component. I calibrated and man is it gorgeous. The look of it is ok, not ACD but I only paid $430 for it (retails for $600 at BB). I am going to pick up another one soon.
Do some more panel research. EIZOs don't even use IPS panels yet they are some of the most highly regarded displays in design. The electronics and LUT control are what is important and that is where Apple falls behind. PVA/MVA panels also have better contrast ration than IPS panels.
The 2407WFP-HC is very promising it uses a panel that produces 92% of the NTSC color gamut and has CCFL backlighting. If you want a beautiful Dell that is close to the beauty of the ACDs take a look at the 2707WFP. It is a gorgeous display.
http://www.anandtech.com/displays/showdoc.aspx?i=2961
It is kinda pricey, especially when you look at the 30" pricing, however because of that they haven't been selling all that well. There are people who have called Dell and bargained a bit. You could probably get it under $900. You will have a bigger pixel, but some people like that. It also has a the 92% color gamut and CCFL backlight.
