If you get into advanced science or bachelor of psychology, I don't think that you need to minor in anything else.
If you are going to do psych in the standard science degree, I would suggest that you do a minor in statistics, as there is some synergy there. The other advantage is that if you decide to ditch the psych along the way, you will still be reasonably employable, as there is a big demand for statisticians.
This does assume that you are not totally adverse to mathematics, of course.
Edit: I see from your profile that you are doing MX1, so all should be cool. You just have to make sure that you do MATH1131 and MATH1231 in first year rather than the easier maths subjects for life and social sciences students. Then you still have the option in second year of taking more maths subjects.