WordPress SEO is the best SEO plugin out there. You can set the settings and let the plugin do it's thing automatically. Or you can fine tune the SEO on each individual page.
I have still had some issues with it conflicting with other plugins and the sitemaps functionality doesn't seem to work very well. However, it's the best plugin I've been able to find for SEO.
Read my full [ link redacted, please do not post links in the review section ] for more.