I'm also looking at getting the theatrical versions on Blu-Ray too. I know FotR was supposed to have some issues with a bad transfer/too much green or something. Was there a release that fixed that?
Both the theatrical and extended Blu-rays of FOTR got criticized, though for different reasons. The last time I watched the theatrical version was long before the Blu-ray release so I can't comment on that. As for the EE, the green tint is only noticeable side to side comparisons with the DVD version. It's never been a problem or even noticeable when watching the film for me or anyone I know. There has not been another release since 2011 that affected the color correction (or anything else), but all versions of the films have been run through varying degrees of color correction. The bottom line is that the EEs look great in both DVD and Blu.