Are you guys here to argue commute times or to help the OP? Where is the 'dislike' button?
Ausnuck, what you need to know is that the GTA is a nightmare for commuting to work from anywhere to anywhere and that your 30 minute criteria may not land you in a neighbourhood that you are happy with.
I would suggst you pick the neighbourhood and live with the commute whatever it might be. The average commute for Toronto and the entire province can be seen here:
Toronto area commutes add to time crunch, study shows | Toronto Star
As you will see, the average is 47 minutes and by inference, the average in the GTA is around an hour.
Most of the GTA area is wall to wall built up with suburban cookie cutter houses, townhouses, apartments, all within a few feet of each other. Most of the area is not 'neighbourhoods' in my description of what a neighbourhood is at all. Most areas are indistinguishable from each other.
Since your job will be near Winston Churchill and the QEW and I am guessing your employer will be paying for a hotel until you find a place to stay, I would suggest you consider the Hilton Garden Inn which is more or less right at that intersection.
From there I would suggest you take a drive south down WC to the Lakeshore and then go west to Burlington and then east to Port Credit. Look at Burlington, Oakville, Bronte, Port Credit streets between the Lakeshore and the QEW. Those 4 places do have an actual town centre to them unlike some of the other places that have been named here. Places like Brampton have a town centre that basically consists of a shopping mall. You couldn't pay me to live in most suburban GTA 'towns'. The closer to Lake Ontario you are, the older the neighbourhoods are. As you move north and west, the more cookie cutter things become with few exceptions. Take a drive right up Trafalgar Road to the north and look at Georgetown which has a nice little town centre for example. Halton HIlls is another nice little town.
To me it is really more about what kind of neighbourhood you want to live in. If you are happy in a cookie cutter house on a cookie cutter street in a cookie cutter suburb, driving your kids in a cookie cutter car to a cookie cutter school, no problem finding a place to live. If you want a bit more than that though you are going to have to look harder and probably commute longer.
If people were willing to admit it, the reality is that where 90% of people live in the GTA sucks. And less someone accuses me of being some kind of anti-GTA nut, I grew up in Etobicoke. But on the Lakeshore in what was an actual small town back then, New Toronto.
I would suggest you Google for the places being suggested to you and see what you find. For example read here:
Explore: Port Credit’s a genteel place to live | Toronto Star