Hi Toniboni88,
Why don't you try JFusion?
Home
It's by far the best yet FREE Joomla / forum integrator component in my opinion.
If you have any problem, feature request, feedback or anything, just post their forum and you'll get fast feedback from the developer team. They have just released their first beta version on last Dec 25. You can expect their next release somewhere this weekend (patch 02) to include many more feature and bug fixes.
Just make sure you have valid vBulletin (their integrator won't work with nulled / cracked vb copy).
Hope it helps,
Zettian