I too , have heard good things about Tilly hats, and have a Booney or two.
You might like to look at
http://www.scottevest.com/v3_store/40tec_hat.shtmlit is more of a ball cap, but has some interesting features.
Outdoor research has a few interesting hats over at
http://www.outdoorresearch.com/home/category/Home_OR/headware/headware_allI would love to see an ETS designed "survival hat"
Lee