Actual preservation of the original?
Puggo Grande - Puggo's 16mm transfer
Recreation of the original?
Harmy's - an amazing recreation using best available sources.
Laserdisc transfer?
My favorite is Mysycamore's Technidisc transfer. It is free of the DNR that ruins the other laserdisc's / GOUT (imo). All of which are the original film except they have the 1981 "episode IV" crawl / intro.
They all have a different look and feel, check em out and see what you like best.