Reasons to upgrade now:
More and more sports are coming available in High-def, and it is unbelievable the difference in the viewing experience. If you watch DVD movies, You aren't really taking advantage of the "new" format unless you have a widescreen tv that at least displays in 480p (the DVD standard). You can use the whole screen on wide screen tv's for standard broadcasts in one of various "stretch modes" built into the tv's. Certain tv's do this better than others, and should factor into your decision making process. I have a 57" Sony High Def RP CRT and am very pleased. "old" CRT technology has come a long way, and what it concedes to all-digital displays like plasma in resolution, it makes up for in other important areas (to me) like accurate colors and better black levels. Plus it costs a fraction of what a plasma costs at this point. Down the road, plasma and DLP prices will drop and their weak points will improve. Until then, my decision was to get a bargain CRT display that allows me to enjoy the "little" bit of HD available, as well as Outstanding DVD experience.
Good Luck