This STARTS at (a minimum!) 1920x1080
Absolutely agree with Elizabeth. That is why I have still have a Sony HD CRT that can acommodate for a variety of signals. The pixel issue is a big problem until standards converge. If you ever tried using the wrong resolution on a computer LCD screen (i.e. other than the native pixel resolution) then you will know what I mean - it goes all blurred. This means an LCD or a plasma will have an OPTIMUM input signal resolution and will not be as good for signals that do not match this OPTIMUM resolution.
If you still have many DVD's and still watch ordinary TV channels then an EDTV with a native resolution suited for DVD's may be your best choice in the interim (until old signals have disappeared and only 1080p exists)
Downscaling High Def 720p to DVD quality works well. Upscaling ordinary TV signals (less than DVD quality usually) to 720P or 1080P may actually look worse than ordinary TV!