This is a description obtained from google search on dot pitch.
Also called phosphor pitch, a measurement that indicates the diagonal distance between like-colored phosphor dots on a display screen. Measured in millimeters, the dot pitch is one of the principal characteristics that determines the quality of display monitors. The lower the number, the crisper the image. The dot pitch of color monitors for personal computers ranges from about 0.15 mm to 0.30 mm.
You may want to look at the spec of other monitors to establish the quality you will get against the price.Perhaps take a trip to pc world to check the quality of image.