Once again I'll shamelessly plug a man by the name of Jiddu Krishnamurti. I find all of his talks and essays to be quite eye opening! He gives straightforward, 20th century discussion on 'being'. It's interesting as he believes truth cannot be found through any particular way or path. Another, even more accessable, writer/teacher is Douglas E. Harding. Try to find a book called "On Having No Head".
Finally, here is a link to an essay by John Wren-Lewis. A big spiritual skeptic until he had his own experience. Check it out!