In reply to Ryan Hellyer.

One more bit of advice: The primary purpose of most of these caching plugins for WordPress is to do static page caching. Static page caching is better off done further up the stack. If you can, use something like Nginx or Varnish to handle your page caching, then install a cache purge plugin. This is much more efficient and will give you significantly better performance than any of these basic static page caching plugins ever could. Plus, they're likely to be less buggy too.