Adywan's AVCHD's are not technically the 97 SE, just an approximation using the HD broadcast of the 2004 SE with some edits to revert it back and recoloring that is probably better than the 97 SE. It's probably as close as we will ever come to an HD 97 SE since Lucas disavows it more than he does the original versions.

If you're truly looking for the best versions, Wookiegroomer has HD copies of all of the movies up on torrents and such, including the 2004 SE.

There aren't an HD copies of the originals (obviously), but there are many efforts to make the best possible anamorphic versions using either the X0 laserdisc or the aforementioned 2006 DVDs. Neither one is perfect.