if your going to buy a CRT HD-TV, then i would save up for atleast a 30" widescreen (like i am currently). saving an extra $100 would be well worth the extra inches you would get.
also like it was said before, DO NOT GET ANYTHING BUT A WIDESCREEN TV. yes while a 4:3 ratio tv will be cheaper and you wont have any of the stretching problems found with widescreen, but you should think about it. if you dont want any stretching on your widescreen then just have it letterboxed on the sides, either way your going to have letterboxing of some kind. also most people are buying HDtvs for high def signals (broadcast or 360) most of which are sent in 16:9 aspect anyways. almost everything is done in widescreen format now and you would regret it within a year if you got a 4:3 ratio tv.
also dont bother listening about the difference between 720p and 1080i. while i would much rather have 720p, as its supposed to be better for motion and video, in the end High def is high def and for your first TV, no matter what, im sure it will be FAR better then what your currently using.
just over the weekend i saw a philips 30" widescreen for $525, it was the floor model but that is still a damn good price. the price for a brand new one was only $650, which is still a good price for a 30" HDTV. in fact i will be getting that exact TV if they still have any in stock at walmart when i get my $$.