I can't begin to tell all of you that post how much I've learned. I want a pj but can't seem to understand the differrences between single chip, like a dark chip 3 pj and a 3 chip one. If you know of any threads, links or your comments about pros/cons/differences, I would appreciate. FYI, my room is 12' x 18' and at this point am considering the H79 or Dwin 4, but open to any suggestions in that $$$$. Thanks.