It's a PR4, we get around 2000 uniques per day. I have no stats, but you can just see how active the forum is and how many users are online and you get the idea of the traffic it's getting. Also, 2000+ pages indexed in google.
I'm offering the following options:
728x90 banner at the top - $40/ month - your banner exclusively, no rotation
428x60 banner right below - $20/ month - your banner exlusively, no rotation