Hey Joe -
Long time... Sounds like you've become obsessed with kayaking, god help ya.
Go to Chile. Who cares how much it costs. It's worth it. I was just there for almost a month (for work, no boating, August is not really boating season anyways). I also went 4 years ago (for boating). Paddle the Futaleufu. There are tons of other rivers, too, I paddled a few in Pucon region, they were fantastic. The Fu is a must do, for at least a week, better 2.
The rivers down there are at risk of being flooded. Last month I attended a meeting on sustainable development options for Patagonian Chile and did fieldwork with a scientist on the Baker R. A big focus of our work was addressing the proposed dams on the Baker and Pascua (south of the Fu). The EIA for 5 dams on these 2 rivers was released in Aug., and is out for 60 days for comment. These dams are very likely to be built, and when the 2000 km long powerlines to the north are built (another environmental travesty), the door will be opened to more dams in Patagonia. The time to go experience this place is now.
"Wheresoever you go, go with all your heart..." Confucius