MAN FROM DEL RIO (1956), but I didn't realize how many new titles were out until reading comments accompanying a post at 50 Westerns From the 50s.
Thanks to the info acquired there, today I purchased a nice widescreen print of Ben Johnson and Kent Taylor in FORT BOWIE (1958), a film I've previously recorded in pan & scan from Encore Westerns. I haven't yet had time to see it so I'm looking forward to my first viewing being a good DVD print. The few minutes I saw of the film when I recorded it looked quite interesting.
Also out from MGM: FORT DEFIANCE (1951), a good-looking film starring Johnson, Dane Clark, and Peter Graves; George Montgomery and Ellen Drew costarring in DAVY CROCKETT, INDIAN SCOUT (1950); and Joel McCrea in FORT MASSACRE (1958).
The MGM DVD-Rs can be purchased at Amazon and also at Screen Archives Entertainment.