Seems to me, since you're already a daily writer in the habit of finishing works, NaNo is almost redundant for you. If you treat it as an exercise, sure it has its benefits. But you seem to be beyond needing that exercise. So why deal with the word count stress?

For those of us who like to write but don't do it enough, NaNo is a good kick in the butt. I always thought the whole purpose of it is to get a writer writing, to kickstart a habit. You don't really need that part of it. But then again, it's always good to win something. :)