I called several places to check on prices, and Real Tree Masters had the best prices, as well as the best reviews on Home Stars.
The arborist was quick to come and provide the report on the tree I was looking to remove from my backyard (left the back door open and he came within a week). He guided me through the entire Toronto permit tree removal request form. There was also some more info required by the City of Toronto, and he was very helpful in resolving their concerns.
The permit was issued a few wks after by the City of Toronto and the actual removal was booked a couple wks after that. They came during the day, and when we got home from work the tree was removed and the entire area was clean (as if it had never happened, and noting this was a 40ft tree and there is not a lot of room between the houses - typical Toronto home).
Very happy with the overall experience. Thank you.