Red River
How the West Was Won
For a Few Dollars More (I just enjoy it more than The Good, the Bad and the Ugly)
Tombstone
Silverado
Dances With Wolves (PC it may be, but still an impressive epic)
Jeremiah Johnson
The Train Robbers (not great by definition, but a personal favorite with a top-notch cast)
Blazing Saddles
The Wild Bunch
I was going to say Jerimiah Johnson - but not sure if it counted as a “western”. That would be a nice one to see on the big screen again.