First, from my experience, VHS looks absolutely the worst on a big-screen TV. I think VHS is only 240 or 260 lines of resolution, which looks terrible. For DVDs, from my experience, they look great on my 50". Make sure you either connect your DVD player by component or HDMI, and set your DVD player to "Progressive-Out" and that will give you the best that a standard DVD can give. One option is that you can buy an upconverting DVD player, which upconverts to 1080i. For regular non-HD channels, it depends on how you are receiving these. Roof antenna? Cable or satellite box? If the latter, don't use anything less than component connections. Then, the rest depends on how good your TV handles the standard-def signal. Some TVs are much better than others. If you can, spend the extra $10 per month and get an HD cable or satellite box, then you will receive digital TV signals and the HD cable box will send everything through at 1080i. Yes, 1080p is the "future", but it's not in the cards for broadcast TV any time soon. For 1080p, you need to use PS3, XBOX or high-def DVDs.
I am planning on buying a new tv. I am planning on going with an lcd 46-50". I was wondering how dvds & to some extent how vhs tapes as wellas regular non hd channels will look. Is there a reason not to buy a 1080p. I know thats the future will all cable or satellite channels look good on these sets.