I wrote this some time ago about it in the 'Last western you watched' thread:
SERAPHIM FALLS (2006)
A revenge/pursuit western, set in the aftermath of the Civil War. Southerner Liam Neeson and his hired guns are chasing Pierce Brosnan from the snow-caped mountains of Oregon to the sun-baked plains of New Mexico.
Why Neeson is on Brosnan's trail we learn only relatively late in the movie, and the intended 'twist' is a bit of a let-down, leading to a heavy-handed, over-symbolic finale. Otherwise it's a good western, beautifully shot and quite compelling.
I have never been a fan of Neeson nor Brosnan, but they both turn in a decent performance. Still, they play second fiddle to the landscape: the film seems to underline the futility of man and his aspirations in the majestic world he's thrown in. Taking the setting into account, there clearly are references to contemporary American society, once again struggling with painful war experiences.
There are some pictural references to spaghetti westerns (The Great Silence and Once upon a Time in the West in particular) but with its deliberate pace, strong emphasis on landscape and sudden outbursts of graphic violence, the film reminded me most of the Aussie Eastern/Western The Proposition. So if you liked that one, you're very likely to enjoy this one too.