i am going on a 11 day (9 days camping) trip to the cordellera blanca mountains in peru next summer and im looking at getting a 30d (not just for the trip. im finally upgrading to digital from my two extremely reliable manual film slrs). how many batteries am i going to get me through the 9 days if im taking like 50 or 60 shots a day? also, since ill need extra batteries and i dont want to pay $50 a pop to get canon batteries is there anyting wrong with the non proprietary ones? they're batteries are alot cheaper and i was wondering if this was because of a lack in quality. also, any ideas for cool shots or stuff to see/do there from anyone whos been there? thanks alot EDIT: Oops ment non canon batteries not non proprietary. i.e. canon type batteries made by a different company.