I know not everyone is a fan of Disqus, but it's as easy to implement (OK, the scripting side, anyway) as Google Analytics. Probably wouldn't be more than a couple of lines to have that option and then put Disqus comments at the bottom of the template.
Problem with using Disqus (and similar solutions) is that comments are at Disqus, so you have no real control over them. Yet not many people care about it.
Ask HN: Open source commenting systems for static pages - alternatives to Juvia?
Can you not import them locally via the Disqus API, so that if at some point in the future you are not happy with Disqus, you can move to an alternative solution?
