I'd say at least extension 1 English, if not extension 2. And do something that reflects the area of journalism you're interested in for the EE2 major, because you can then use it as part of a portfolio, if you need it. Other than that, it's really mostly down to what you're interested in - if you want to be a journalist specialising in concert reviews, then doing music would be good, and if you wanted to be a sports writer PE would probably be useful (to some degree). And the sorts of subjects where you have to do essays wouldn't hurt, because you'll get lots of practice at writing.
Have a look at information from unis, and see what the general pre-reqs/recommended knowledge is. Even if it only tells you what level of English you need, you'll still be able to make sure you're going to fulfill the requirements to get into the course.