Max - I also subscribe to Pauline authorship, although I believe the actual author is not a major issue. Hebrews lacks some of the personal nature of the other New Testament epistles, whether they be Pauline, Petrine or Johannian.
I view Hebrews as a thesis of sorts. It is a high and grand treatise of the supremacy of Christ over the Law. Given Paul's formal education and the fact that he was a Pharisee (Phil. 3:5), the knowledge of Law that is contained in Hebrews makes an argument for Pauline authorship more than plausible.
