Seems to be the cheapest 24" i could track down on ebay, the sony's and the old sun brand 24 inchers areall 4-500 dollars.
Even at 100$ for the hp the shipping will be outrageous, it would be better to track down a crt hdtv.
A 26", 30", or even 34" crt hdtv will be cheaper and easier to find. The best ones are the Sony xbr's which offer the highest resolution.
Crt hdtv's will all accept 1080i resolution and as long as you feed them a 1080 signal there shouldn't be any input lag.
The problem with crt's is they don't usually display all 1920 lines of resolution even though they support it. Sony's xbr line can display around 1400 lines while most other brands and lower end sony's offer around 1000 lines + or - 200 lines which would only provide around 1000x1080i.
The hp's specs indicate that it should be able to resolve full 1920x1080p or very close to it. The question you have to ask is, is it worth paying the same or more for a 24" monitor where you may not even get the benefit of the full 1080p or is a bigger screen that can provide an adequate hd resolution a better option?
Ask around on the forums about the resolution of different manufacturers if you go for something other than an xbr, brands that I know of are Sony, Toshiba, Panasonic, Philips, and Samsung,
I have firsthand experience with this issue myself as i'm running a 51" hd crt rear projection at 1080i as a monitor with no noticeable input lag and a reasonably sharp picture at around 1200x1080i advertised resolution. This doesn't mean the image is stretched abnormally it just means there is less horizontal detail.
You DO NOT want to feed most if not all directview crt hdtv's with a 720p signal rather than a 1080i signal as they will have to scale it to either 1080i, 540p (rare), or 480p which will introduce input lag.
EDIT: It looks like the hp is in fact 16:10 which means it will probably accept and display 1080p but it will have black bars at the top and bottom with proper aspect ratio equating to a smaller 22" or so screen, a crt hdtv is definetly your best option.