The following are things you need to consider before buying a LCD monitor for your computer:
1: Check respon time. Response time is the amount of time a pixel in an LCD monitor takes to go from black to white and back to black again. It is measured in milliseconds (ms). Lower numbers mean faster transitions. high respon time will make ghost effect. Generaly respon time is 5ms, but some product have 1ms respon time.
2 : Connector availabality. Check VGA card connector, it must have same type with LCD monitor.
4 : Guaranty and service centre available. Replace guaranty is better tahn service guaranty.
5 : Check the box. Box packaging must be in good condition and have a manual book.