Norm Geras of Normblog has conducted a number of reader polls over the years and I've participated in a fair number. His latest is favorite Westerns and the deadline is the end of November. (To enter, look for Norm's email link in the upper right-hand corner of his blog.
I've put together my list. It doesn't include very many classic Westerns and no Clint Eastwood. On the other hand, it is heavy on what might be called anti-Westerns.
Here's my list with the top three picks as allowed by Norm's rules.