I haven't tested a 26-inch (25.5-inch) monitor in a good long while, and now I have two in testing: the Planar PX2611 and the HP w2558hc.
While the HP uses a typical TN panel, Planar saw fit to use an IPS panel as its underlying tech. The best thing about IPS displays are their viewing angles. In of the Planar, you can see how wide its viewing angles are, especially when compared with the same shots of the HP.
Look for full reviews of both coming here, and in the meantime, take a look at the pictures and compare and contrast. Then get back to me with your thoughts.