In my experience, there was really no problem using my PS3 with my Dell U2410. I plugged in the HDMI calbe and I used the audio output port to plug my computer speakers.
I use gaming mode, I can't see any noticeable difference compare as when I play on my Sharp Aquos. I play FPS like COD...
I have the same monitor, made in October 2009, Assembled in Mexico, Rev A00...
The first one had no green/pink tint issue but had one bright pixel, so I shipped it back...
Second one has no tint issue that I can see, no bright pixel, looking good...
So maybe new monitor from October...