if you odnt want HD then dont buy a new tv....well anyway they are all hdtv capable (well atleast 1080i or 720p) true full HD sets are not out or very expensive (10k) Id recommend a DLP in place of each. Samsug has some good ones. they are priced similar to LCD but way less than plasma. plasma will most likely be our of your price range for something decent. both lcd and dlp have advantages and problems. just go look at each and see what looks better. dlp has better contrast ratios but some people have problems with colorwheels and seeing rainbows. lcds may have a screen door effect and weaker contrast.
www.avsforum.com is a great site to read up on all stuff audio video from low to very high end. definately check it out.