I can second the Dell for good image quality.
I have had the 2209WA for a year or two, it's 22" and runs at 1680x1050 (it's a 16:10 aspect ratio).
They have released a follow up series with 23" monitors that also feature displayport connectors (mine only has DVI and analog).
The good thing about these Dells is that they give you IPS panel performance at lower prices. They use an e-IPS panel type which has most of the advantages of the IPS design but at a lower price.
The only problem with IPS is that the bigger ones tend to get pricier. However, for 22"-24" sizes i think the benefits of no color distortion and true 180 degree viewing angles justifies the slight price difference.
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