Here's a third option to consider: The price on that U2410 seems pretty outrageous but then again I don't need 110% gamut; I'd rather get the Planar PX2611W instead - it only promises 92% gamut instead of the 110% gamut there, but it's
damn accurate and also considerably less expensive ($200 or less). I find the Planar more than adequate for serious photo editing. I've posted about the input lag here before. The only place it likely falls behind is in response time; there's a bit of ghosting (at 12ms, apparently there is a 5ms option but I've not seen it) and it's noticeable - but I've played a lot of FPSes from all generations (Heretic, Quake, new stuff) and it doesn't bother me.
There's no rotation hardware but the OSD gives a lot of great options for resizing images - 1-to-1 pixel mapping (doesn't work correctly on the Windows XP boot screen, but does on everything else I've tried), full-screen pillarboxed, and stretched fullscreen, plus there are options for setting blur amount when stretching, from 0% (sharp pixels) to blurry. The panel also reportedly does bad with 1080 sources; I saw this when my graphics adapter was set to 1920x1080 but I didn't try using a non-stretched mode, so I can't say for sure it's going to suck with 1080p sources. What I saw wasn't good though.
That HP panel looks decent though I don't see anything there on input delay. It definitely wins on price though (if bought at the B&H Photo & Video price, which is cheaper in dollars than the U2410 is in pounds!).