I think I could be persuaded. 

For space westerns, Firefly is good; or, if you'd like some cassette futurism aesthetic while keeping the western theme, I had been thinking about a romp in the Cowboy-Bebop universe. 

To keep things linear and on track, at the expense of "open world", I might suggest a heist plot ala [i]War Wagon[/i]. That's a [u]good[/u] movie, btw.