To answer your question:
For the time being, no, there isn't a better video transfer of the unaltered versions. For the 2006 unaltered dvd release, Lucasfilm simply recycled the 1993 laserdisc master (which - to the best of anyone's knowledge on these forums - is the same transfer that was used for the 1995 "one last time" laserdisc). Their reasons were that "existing prints are in poor condition," which could mean anything.