I thought Lonesome Dove was awesome too. I’d like to add Tombstone with Kurt Russell, Silverado and Unforgiven.
I'll climb on the "3:10 To Yuma" bandwagon, along with "Open Range", "Broken Trail", "Unforgiven" (again, not exactly a current movie), and the 2003 remake of "The Alamo".
Robert Duvall, Sam Elliot and Tom Berenger are probably our best current cowboy actors, IMNSHO. But I do miss The Duke, Arness, the entire cast of "The Magnificent Seven", et al.
Scouts Out! Cavalry Ho!