Alexis of Toronto Health Spa had enormous breasts when I saw her a couple of years ago at Health International, but I hear that she's lost some weight, a bunch of it in her boobs, so I don't know now. She gave a FANTASTIC massage, too.
On my to-do list for a long time has been Isabelle (Isabella?) at Barbara's/Daisy's. I've read some great things about her, particularly that she has enormous breasts, but I also read that she only works on Saturday afternoons now, and even that was a while ago, so for all I know she could be out of the business now.
Some pictures of Alexis here: http://www.torontohealthspa.com/