Generally speaking, LCD monitors with contrast ratios of up to 1000:1 are more or less truthful from some prior research. I would any LCD that lists between 600:1 to 1000:1 will be fine.
Also be aware that some LCD monitors' spec can also be conservative sometimes as well. I recall reading a few reviews from tomshardware that showed actual contrast ratio was higher than the listed specs.
I don't recall which monitors those were since I was only perusing.
The most important thing to do is to read actual hardware reviews of any LCDs. User reviews are okay to get a general idea if the monitor is good or not, but it's reviews like the ones I provided the link which should be your first priority.
Next up, I would try and find a store that carries the unit(s) so that you can see and touch it yourself. Not always possible though. For example, based on hardware reviews and user reviews the BenQ FP241WZ is at top of my short list despite the fact that only online stores carries them and they are a bit expensive; starting at $780.
For me the most important thing is a quality panel technology; P-MVA, S-PVA or S-IPS. Those panels produces 8-bit color (16.7 million "real" colors) as opposed to TN panels that 6-bit that can only produce 262,144 "real" colors. 6-bit TN panels can "produce" up to 16.2 million colors by using a dithering algorithm; some brands lists 16.7 million colors to confuse people.
TN panels are good for gaming because of fast response times, but poor for everything else (at least to me). Because TN panels uses dithering their color accuracy is not as good as 8-bit panels. That can cause artifacts to appear more often when watching a movie. Some people are oblivious to the artifacts because they may not be able to notice them.
Don't let my comment stop you from buying the Samsung 225BW which does use a 6-bit TN panel. For me, I expect a certain minimum level of quality for the money I spend. Besides TN panels are inexpensive compared to the other panel technologies I listed.
A lot of people simply balk at the price difference between a 22" LCD and a 24" LCD. Is the extra 2" worth the extra $300? Most people will say no. The simple fact of the matter is that all 22" LCDs uses inexpensive 6-bit TN panels, while all 24" LCD panels uses the more expensive P-MVA or S-PVA panels. The really expensive one $1,200+ use S-IPS panels.