http://www.mec.ca/AST/ShopMEC/Electr...rex-30-gps.jsp

VS

http://www.mec.ca/AST/ShopMEC/Electr...rex-20-gps.jsp

So far as I can see the main differences are the barometric altimeter and the electronic compass. Any other reasons to get one over the other? Is the $100 worth it? Is a barometric altimeter nice to have? Which one would you get, and why?

Thanks,

C