Add forum to exsisting site

OK, I need a forum added to [login to view URL] to fit into the existing website. Should contain all the following features: 1. Signatures, detirmined by user 2. Ranks, increases by the amount of posts that are done. 3. Avatars 4. Polls 5. All relevant sign up pages so people can post. 6. All colours and themes must fit into the current site 7. Background should remain the same, header the same and possibly the left navigation menu. But use trial and error. Max budget $100.00 need done within 2 days Thanks