Secondly, you will always to deal with trolls. If you have mechanisms in place to make people spend less time responding to trolls, you'll retain the sanity of the sane users and diminish incentives from trolls.
Thirdly, you have to rethink the way stories are voted on.
Thankfully, we're building that. If you sign up on forrus.org, I'll let you know when we roll these features out which should be in a month. We're actively just inviting people who are enthusiastic about these ideas because we want to grow the community slowly but with lots of quality.
That said, I'm a fan of Debate and Discussion subforum of SomethingAwful, which is remarkably intelligent and reasonable (although admittedly slanting heavily towards liberals and libertarians).