Yep, or even better, Disqus. This gives people the option of using multiple accounts they already have, and people are concerned with their reputation, which always helps behavior.
If I go with an in-Wordpress solution, it'll probably be Disqus. I initially liked the idea of having a clean troll-less page for users who don't care about commenting. Maybe this is just vanity. I also like having the entire discussion in one place, instead of a thread on HN and another thread on my blog.