theGrg wroteHow about the same question for a 27" monitor on a $400 budget?
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Edit: Best 27" I found is the "Viewsonic VX-2703MH" from pcandparts.com
But I'm not too impressed with the monitor. Also, should be wall-mountable (VESA).
If you want want to get a 27" monitor be sure to get at least a 1440p one, 1080p is horrible on 27" monitors.