Planning on heading up to the Sebring 12-Hr event next year, and would like to bring along my T2i. I currently have just the kit lens, and would like to change it out for a more versatile lens to document the trip. I've had my eye on the Canon EF-S, 17-85mm, EF-S 18-135mm, EF-S 18-200mm, as well as the classic 70-200 F4/L. I would prefer not to have to change out lenses while there to reduce any dust/debris issues. Anyone have a recommendation among those lenses, or perhaps any others that would be a good all-around lens for under $800? Thanks for any help/info.