I still think Jason Isaacs is a better actor...and IMHO, is closer to the physical Roland that King paints. He can be both baronial and ruthless...
... and does the stubble thing pretty well.
You shouldn’t have any problem with Crowe as a cowboy if you’ve seen 3:10 to Yuma.
http://www.youtube.com/watch?v=pVyTEGGp3Z0
or ‘The Quick and The Dead’.