Regular TV gives roughly as much resolution as a Super 8mm movie, while HDTV is supposed to be almost as good as 35mm, and because its signal isn't limited the way the conventional color TV signal is, fast movement should look a lot better, and you won't see rainbows around vertical stripes. But the 3 HDTVs I've seen, Philips, Mitsubishi, and Panasonic, were so disappointing that I thought they were receiving conventional TV signals. So I came back when I knew there was a broadcast of an HDTV program (Raymond), but the picture was no better, only about as good as 16mm film.
I'd wait until the price comes down to the level of a Sony WEGA, and HDTV VCRs become common.