you have to look at whichever schools you will be applying to.
mcmaster doesnt even have course requirements to get into their medical program... infact you dont even have to write the entire MCAT for mcmaster... i think its just the written portion.
in essence... look directly to the schools you will be applying to and judge which courses you should take based on what will keep most doors open.
also, refer to this thread:
http://www.macinsiders.com/showthread.php?t=1985 2