After trying to implement my Database models on Doctrine ORM for about 5 hours,
(I must mention that I do have experience with Doctrine 1.2, which is useless for Doctrine 2 since they change everything)
I decided to try Yii Framework, and surprisingly, it worked like magic!

After about 20-30 minutes while reading the unbelievably high quality documentation,
I was able to not only configure the models, but also the relationships were automatically identified. (whoa?? including Many to Many ?!)

So thanks Yii guys, you created a hell of a framework! :-)