[H] time for a LCD

[Winterlight]

One of my CRT 21 inch monitors hit the dust a couple of days ago, so I am 
going to replace it with a LCD. I am thinking one of the 20 or maybe 30 
inch Dells I hear so much about. But I am concerned about the new video 
standards that monitors need for HD. I don't want to do this now only to 
find that everything changes in six months, and my new LCD is dated. I can 
wait if I have to.... or is it much of a issue?

 Can anybody, who is familiar with the issues, break this down for 
me.  And any thoughts on 20 inch and 30 inch LCDs. Thanks