Sorry to jump in late (I have been away a long while), but as to the original question of what to read:
There is a whole lot of worthwhile reading available, and (in general) I think a "reccommended reading list" requires (or, at least, requests) a topic of general inclination.
That said, I will always put forth Descartes's first two chapters of his Meditations as a requisite preface - he addresses, in succinct and cogent fashion, the question of what can be known. To me, this is the foundation of meta-thought.