FlatPanels HD recommendations (updated regularly, new models added, old models removed):http://www.flatpanelshd.com/focus.php?subaction=showfull&id=1229341472
You want to be looking at the 'Graphics Monitors' section, about half way down the page.
Generally, for color accuracy, you want to be looking for an IPS panel, with a wide color gamut.
Once you've identified a potential candidate, it's worth doing a general google search for reviews. The Dell U3011 seems to be reviewed consistently highly (and in the States is only a couple hundred bucks more than the Dell U2711, which is not ranked as high consistently). Note that some people feel that Dell has been particularly heavy handed with the anti glare coating on some of their displays, with some people complaining that it's like trying to look through a screen door or dirty windows (several of the Dell U2711 reviewers on Amazon seem to mention this, IIRC).
Matte displays are generally more color accurate, striving for neutrality, rather than glossy displays with over-saturated 'pop' meant to wow the average consumer. This is the same as the music industry, and the general rule is that if you can get a picture (or music) to look (sound) good on neutral unflattering media during the post-processing (mastering) process, then it'll look great on consumer gear, designed to wow; while the reverse is not necessarily true (material that looks good on a flattering display can look flat & uninteresting on a more neutral color accurate display).
I just went through this process myself, but my requirements were different. I wanted a 1920x1080 display because 1. it's the same resolution as my notebook screen, so I can do 1:1 mirroring of my notebook display on my desktop monitor, and 2. that res is effectively 1080p, so I can display 1:1 1080p content without upscaling / downscaling / underscanning / overscanning. Also, I already have a generic 1920x1200 24" display, and wanted something larger than 24", so I can more easily view 2 full scale pages of a doc side-by-side for business use, without too much eyestrain (I am mildly near-sighted, and don't use glasses when using a computer). I did look at some of the 23"-24" Dell IPS displays though, but was put off by the fact that some of the more recent value-oriented displays (U2312HM, U2412HM) were missing an HDMI port (though they had DVI & the newer Display Port connections). I looked briefly at the Dell U2711, but was put off by some of the reviews on Amazon, and the fact that the more consistently better reviewed Dell U3011 is only a couple hundred bucks extra. Sadly, though, the > $US1100 for the Dell U3011 is more than I currently wish to spend.
So I just ordered a 27" 1920x1080 (1080p) Samsung TN display (P2770HD), that was pretty cheap (US$ 300), seems to be consistently well reviewed across a number of sites (Amazon, B&H, and a number of others), and has a plethora of analog inputs too (though I wish it had a 2nd HDMI and Display Port inputs as well). Upon reading the reviews for this particular monitor, it seems that one caveat is that when using its HDMI input for a PC display (as opposed to a multimedia display), you need to go into the menu and tell it that the HDMI is being used as a PC input to disable overscanning, so that it uses 1:1 mode (thereby preventing fuzzy rendering of text).
I realize that in general a TN display is not as desirable as an IPS display for color accuracy, but photography is just a hobby for me, and my newish notebook has a decent (but not great) 17" 1920x1080p matte display, which I can also reference when editing photos to help make sure the color doesn't look too flat on a matte display. I haven't received my Samsung P2770HD yet (it is due to arrive tomorrow), but if it looks pretty decent, while also serving my other multimedia & business needs well, at a value price, then I'll be satisfied. If I don't like it, I'll just return it, or move it into my bedroom as a multimedia TV, connected to DVD player/netbook etc., and wait until I can afford a better quality, >= 27" IPS display later.
Either way, for you, moving from a 19" monitor to a larger size, higher res, newer technology display is likely to be a significant improvement, so it's important to keep that in perspective too. Just make sure that your somewhat older graphics card has the requisite connections, and that it will support whatever resolution you choose for your new monitor, at least in 2D mode (2D mode, used for static display, such as photos, is less taxing than 3D dynamic display, such as used for later movies & games).
Hope that helps.