Hmm, I don't know how you reached that conclusion, even given the current available info
The HP most definitely averages somewhere around 2 frames of input lag (17-33ms) given all the info I've seen from everyone who actually knows what they're talking about on this issue. Go to Youtube and there's several HP input lag tests available. If you download the flv file and advance the video one frame at a time you'll see the HP averages about 2 frames of lag Vs a CRT. This is consistent with the TFTCentral review which rated the screens lag at 25ms. This is usable for most, but not for people who want to play fast first person shooters online in any competitive way.
The U2410, in game mode, averages below 1 frame of lag (if the CNET guys numbers are right
), which means the Dells lag is about HALF that of the HP in game mode. However it does this by bypassing all the internal image processing. This means your image now has the full wide gamut. Is this a problem? Well, it depends..
Firstly, with the right colour profile (and if Microsoft are to be believed
) Windows 7 will solve current gamut issues. This means, when you switch the Dell to game mode it won't suffer the over-saturated reds and greens. Secondly, this is something the HP suffers to a degree anyway, since it doesn't offer the 12-bit LUT colour management that the Dell does in the first place!
Having said all that, the cheapest UK price I've seen for the HP is about £100 less than the cheapest Dell price I've seen so far. So, unless you care about gamut issues (which, if you plan on using Windows 7, you don't) or having lower input lag from the Dell, this premium is clearly NOT worth the price difference. They're both using the same panel and, unless the back-lighting on the Dell is drastically better, the image quality will be very similar in standard wide gamut scenarios. The Dell should look better in standard RGB mode, and the pre-calibration means it should also be more accurate out of the box. Other than that it comes down to things like looks/inputs and whether you'd rather take your chances with HP or Dell customer service when you have a problem