I am not Buddhist but I like the epistemic rationality of Buddhism. It provides a purpose for life and a how-to guide that seems to get to the core of the human condition.

I agree, it's potent stuff, especially when combined with modern tools like CBT: you can see how a strong rationalist might grow up on science, Buddhism, and CBT alone.

In my experience rationalists generally come from the Liberal-Scientific-Secular-Buddhist crowd or the Libertarian-Techno-Furutist-Objectivist crowd, and the old Liberals and the old Libertarians tend to eye each others' origin stories with a cocked eyebrow. I of course still think my old team was the better, more Enlightened one.