My pick from your lineup would be the 18-135, 55-300 and Tak 50/1.4, for evening around the fire kind of shots...perhaps consider a good teleconverter if you find that you need to extend the 300mm, less weight than the Bigma
EDIT: Regarding dust, crewl1 are indeed correct, you'l be in the middle of our dry winter and will see a lot of dust. Depending on the trips of the day, the guide should be able to tell you the kind of terrain you'll see most of the day, allowing you to plan your focal length for the day. Keep switching lenses to the minimum.
Last edited by altopiet; 04-17-2013 at 06:57 AM.