That's tough luck loosing 2 paddlers. I would definitely recommend going to Turrialba first. I'd say you're pretty likely to find a good crew there since you'll be around for a month. Most of the paddlers stay at Hotel Interamericano so that's another place to look for a group. I was able to join a group of Canadians last year, and it worked out pretty well. Good luck to you Josh!! Keep me posted if you have any questions. Say hi to Phil at Rainforest World for me while you're in Turrialba.