You would probably like dark_jedi's preservation here best:
http://originaltrilogy.com/forum/topic.cfm/Star-Wars-Original-Trilogy-Theatrical-Editions-Info-ALL-versions-SEE-FIRST-POST-FOR-INFO-AND-AVAILABILITY/topic/10550/
The V3 DVDs are very nice.
You MAY want to check out Harmy's despecialized editions too. This is the Star Wars link:
http://originaltrilogy.com/forum/topic.cfm/Harmys-STAR-WARS-Despecialized-Edition-HD-AVCHD-DVD9-and-NTSC-DVD5-AVAILABLE-see-1st-post/topic/12713/
Proper anamorphic (16x9) is a given with any preservation these days, and 5.1? Heh, are you in for a surprise--the 5.1 mix used by dark_jedi and Harmy will blow away any mix you have ever heard for Star Wars, ever, period.
As for color correction, these both are color corrected, because the color on the 2004 DVDs is simply badly inaccurate by any objective standard.