$100,000 = around £50K UK, easily achievable in the UK as an ATCO, especially in NATS or as an experienced non NATS ATCO away from the high cost of living areas of the UK.
As nice as Canada may be, I am told that the overall cost (not just the headline figures) of living is only marginally less and the overall quality of life is only marginally better .
I'm not sure that I'd give up everything here unless the salary was guaranteed to be siginificantly more and employment guaranteed for a significant period of time.