In my opinion, Bank of Canada will not raise interest rate before summer 2010, and also, if raise, it will be only .25%. 1.65%/.25% is 6, means BoC will have to raise 6 times over the 5 years, starting next year to reach your fixed-rate mortgage.
I will pick variable rate but paid as fixed rate. That way, you can always take advantage of low rate, and enjoy the extra payment towards your principle in every payment.
If you are getting 2.85%, and pay as 3.65%, you are paying .8% interest towards your principle, thats 800 per 100000 amount. If you pay .8% earlier years, means you will be paying off your mortgage faster.
Hope that explains.