HP has had a long history of producing monitors with superior specs that look like crap IMO. I use HP LCDs at work with fine specs, but they just don't look that great to my eye (this is a personal opinion only). The HP 30" is one I haven't seen yet, but I wouldn't trust it myself.
Anyway, you might want to check some of these out:
EIZO CE240W -
http://www.newegg.com/Product/Product.asp?Item=N82E16824136036 - I haven't used one of these yet, but this looks like a pretty sweet monitor. Of course, $1,599.99 for a 24.1" monitor is a bit steep.
Sony PremierePro SDM-P234/B -
http://www.newegg.com/Product/Product.asp?Item=N82E16824006084 - I own one of these, and it is great. It's mostly meant for accurate color reproduction (e.g. it uses the same panel as Apple's Cinema Display and a lot of photographers use them), but it actually performs well in gaming. I bought one a while ago, when the price was $1,100, but it has since dropped to $749.99 on Newegg (which is a great deal).
Planar PX2320MW -
http://www.newegg.com/Product/Product.asp?Item=N82E16824016057 - Planar isn't exactly a well-respected brand in monitors (yet). But, I have heard a lot of good things about this beast, so you might want to check it out.
Here are some NEC monitors:
http://www.newegg.com/Product/Product.asp?Item=N82E16824002137
http://www.newegg.com/Product/Product.asp?Item=N82E16824002140
http://www.newegg.com/Product/Product.asp?Item=N82E16824002139
The NEC monitors I have seen seem to be pricey for their size, but they look amazing. Some of them use a glass finish, which you may or may not like. I'd recommend checking them out in person if you can. But, from what I've seen NEC monitors are among the top of the heap.
It's a bit tough to find a good LCD based on other reviews because a lot of it is personal preference. Plus, I've found that the manufacturers stated response time really doesn't mean a whole lot (read THG reviews that test response time and you'll find that manufacturers are full of BS). There is no defined standard for measuring response time, so their results tend to vary. For example, I've seen monitors rated at 16ms gray-to-gray outperform monitors with 8ms gray-to-gray.
So, be sure to test the monitors you are thinking about buying if at all possible!