The three scenes that I think are the most interesting to see from the uncut 5 hr version is the extended helicopter flight (with Tomita music - is it just me or does it sound a lot like Tarna's theme [at 1:45] in HEAVY METAL?), the extended Scot Glenn footage (of which the best scene is on the Complete Dossier) and the original ending, where Martin Sheen stabs a spear through a child to kill a guard - really wished they used that ending for the REDUX version.

In regards to best quality video, short of finding something in a vault, I believe the SubCin version is probably as good as it gets (for the moment)...