I'm a solo traveller and thinking to do trekking in Baliem valley, Papua for 7 - 9 days in December 2013. (And may extend to 14 days to visit other parts, e.g. Korowai or Asmat.) Any advice on guided tour organisers, and other necessary tips, e.g min/max budget, would be much appreciated. I'm also looking for other companions to join the trip or for me to join their trip.