I generally go without the www personally. There is no SEO difference that I am aware of as long as you do proper redirects. One person pointed out to me that

I generally go without the www personally. There is no SEO difference that I am aware of as long as you do proper redirects. One person pointed out to me that with a naked domain you lose the ability to scope cookies to the www hostname. But does that really matter? Doesn't to me, at least yet. In the past, I know some DNS providers had issues with naked domains and redirects, so that may come into play if you have one of those providers. By now though, I would think they all support it properly.