The western I'd love to see on Blu is CIMARRON. Pretty racist by today's standards, the last time I watched the DVD it was apparent it needs A LOT of work.
Edit: And I only need it because it won best picture.
WESTWARD THE WOMEN was released on DVD by Warner Archive, but I would love to have it on Blu Ray as it is directed by my favorite director, William Agustus Wellman.