Want to live in downtown Toronto, but my job is in Mississauga. Which route would I need to take?

I will be moving to Toronto soon and I was wondering...By using the train, how long would it take to get from downtown Toronto to Argentina road in Mississauga?

I don't want to use a car since traffic is crazy (from what I hear) and insurance is expensive. But I don't mind using the Go Train.

Also any other suggestions would be great!

Thanks,