Just thought I'd pop back and say the resolution of the Dell U2711 is actually 2560x1440 @ 16:9.
And the only reason I swapped it for two Dell U3011's is because I wanted something absolutely overkill and I got a really, really good deal on them
Mate you're comparing a TN Panel to a H-IPS panel. The IPS panel is quality beyond measure. You get better viewing angles, better picture quality, better resolution, better everything, which is also backed by Dell's great customer service (Well for me anyway) and three year warranty. I have personally used the Dell U2711 in gaming BC2, etc. etc. and I haven't noticed any lag. Only when the server gets a bit choppy but you can't blame a monitor for that.
EDIT 2: Also dezmick you can grab a refurbished Dell U2711 for quite cheap as well. I know it may end up being a little out of your price range depending on the road you take but trust me you'll never go back to a TN panel if you do. The quality is just jaw dropping.Edited by G. Callen - 5/9/11 at 2:53am