To the best of our knowledge, there's no particular degree or career avenue that is universally recognized as more desirable than any other. What's important is that you find a job that makes you fulfilled and provides the compensation you require. If you can do that, you'll have no trouble convincing hiring managers of your skills and interests, no matter what country you wish to live and work in.
Your passport to finding the job you want is showing how your skills, enthusiasm and persistence are transferable to the area and job you desire. You must find ways to talk about your skills and experience without being tied to a job title that you feel pigeonholes you. To do this, you'll need to gather information and ask questions. The more you information you uncover about yourself and the companies and jobs that interest you, the more likely you'll be able to convince an employer of the value your unique background. With 15 years of experience, there's no reason you should be required to start at entry level again, even if moving to another country.
The good news for you is that the U.S., Canada and Australia all share a common language. This factor alone makes the possibility of moving between the three easier. Since you plan to move to Canada first, contact Access, a program sponsored by the Human Resource Development of Canada (416-921-1800) to help you understand the requirements for working there.