Bank of Montreal has a tool to show you how much you can afford based on your monthly income.
http://www4.bmo.com/personal/0,4344,35649_36691,00.html
Click the link that says "how much can I afford".
With $100,000 down you will have no problem, but they will check to see that the money you have is actually money you have saved over a period of time and not a gift or loan from someone else.