Why put such a big down payment on a house? I'd shoot for 25% down payment as (I believe) that's all you need to avoid CMHC fees. The monthly decrease in mortgage payments you'd get would be negligible IMO. Changing payments to bi-weekly, and paying more to principal than you have to makes as much or more of a long-term difference, and gives you a bit of an easier time hitting your target.

...just a thought