Okay so stepping in with my monitor knowledge of doom here. Also as an HP display guru and fan.
First of all, TFTCentral has some bad numbers - specifically the input latency. The ZR2440w and ZR2740w have updated versions of the ZR24w controller. What that means is it's not 20ms - it's 10ms. (They may have had an early firmware. I've confirmed this number with HP Professional Display engineers. It's 10ms.)
Second, the ZR family is exclusively
CLASS 1 displays. This matters a great deal, and is why the MSRP is excruciatingly high. They are covered by a separate and distinct Class 1 Display policy.
You can find that display here. And yes, this does mean what you think it does - all ZR family displays have a zero-full-pixel defect policy, no exceptions, no questions asked. There is also a zero
bright (colored rather than black) pixel policy. Also, these are BUSINESS warranty covered - meaning 3 year next-day onsite.
Personally, I recommend the hell out of the ZR24w. It's >94% sRGB calibrated - I run three of 'em. The ZR2440w hasn't thrilled me, because I use the VGA inputs in parallel with 24-pin DVI-D and DisplayPort - the ZR2440w deletes the VGA input. However, it is the exact same panel as the ZR24w. Any LED backlit display is harder to calibrate due to the nature of LEDs themselves, but provided LEDs are correctly positioned, sized, and manufactured will give results on par with CCFL without the typical CCFL fade.
Have no fear though.
Amazon has the ZR2440w for $364 and if that's not enough monitor for you, there's always the
HP LP2480zx DreamColor 12-bit at just $2200.