It sounds to me like you're saying philosophical skepticism is the position where we know true knowledge is impossible.  I prefer ancient skepticism which advocates that we create [equipollent arguments][1] wherever we can and thereby suspend judgement.  It's different than simply assuming we can't know anything, it leaves scarce room for cessation of inquiry. [Jessica Berry's recent book on Nietzsche and the ancient skeptical tradition][2] is an excellent in-depth discussion of this topic.   


  [1]: http://mathworld.wolfram.com/Equipollent.html
  [2]: http://huenemanniac.wordpress.com/2011/04/28/on-jessica-berry-nietzsche-and-the-ancient-skeptical-tradition/