Bur Oaks are drought resistant and have a taproot system. You could also argue that they are the most stately tree that is capable of withstanding the Calgary climate. They are, unfortunately, extremely slow growing. You may want to consider adding one to your yard anyway. In 30 years, you'll probably have to cut down the aspens and poplars due to old age, but at about the same time the Oak will finally be coming into its own.
http://en.wikipedia.org/wiki/Bur_oak