I can't suggest a new forum, but I have some suggestions for forum features.
1. Email alerts. It's nice to get an email that says somebody replied to your post, whether you started a new thread or contributed to an existing one. This allows you to continue a discussion. The way it's set up now, your threads are very short. Why? You don't allow people to get back to where they were, and it's hard to remember all the threads one has participated in.
2. Links. Open links in new windows and leave the board open behind it. Some of the links have links in them. If you get lost in all of them, getting back to the board is troublesome. Leave the board open. Open links in new windows.
3. Smileys. I love smileys. Pictures are worth a thousand words, yet you show a list of descriptions to choose from, not images. How ironic!
4. Subscriptions. Why subscribe to a whole board? Sometimes you just want to subscribe to a thread.
5. Spell checking. Make my life easier, eh? That's what computers do best -- repetitious, simple tasks.
You have a problem too. Try posting, and before you're done, click the tab 'related' above the post. You get taken out of your post, and lose all your work! That's bad. Bad, bad, bad.
Need a real board? Try SMF version 1.4.1 http://www.simplemachines.org/ These are great boards and they're free. They work flawlessly, are easy to maintain, and easy to modify or customize.