One thing to remember about all the VHS and LD sources, there was so such thing as a THX screen for home viewing. Transfers had to be made with the home video audience in mind. That audience had as many variation in color, tone, etc., as there were TVs in the world.

The only definitive color for how Star Wars looked in 1977 would be the 3 color separation timing masters if they still exist, or maybe an original interpositive. Outside of that, every print and transfer is going to be different. We can only guess which one is closest. The one great thing about a technicolor IB print is that it doesn't fade and the colors are very consistent, but it isn't the same as a regular film transfer. From the interviews about the color restoration for the 97 SE, the IB print was their guide for the colors. I have not trust that Lowry got even close when they did the digital transfer. They did the older Bond films as well and all the explosions have a pink tinge to them that aren't there in the older transfers. Because of that I find all the colors suspect in the official DVD and BR releases (except the GOUT which has other problems).

I think the best source for the original colors are the products that were made at the time that include stills from the films. Like this image of the LP. http://media.liveauctiongroup.net/i/9873/10845353_3.jpg?v=8CE040475E76D60

Without access to a definitive original source to base the color timing on, I think it is more a matter of preference than accuracy. I don't think any of the VHS or LD transfers (or the GOUT) really comes close to what it originally looked like on film.