k... i know from your comment you really want me to change my CRT to LCD monitor right... Hahaha. :-)
What I am saying there isn't a need to replace it. If it is large enough for your needs and can get a decent ress by 4:3 standards then keep it. Plus they last for decades unlike standard LCD/plasma. They would last much longer but flat panel displays often suffer from every thing like dead pixels to psu failure.