My top three (in no particular order):
Butler's Pantry (Roncesvalles I believe)
Thick slices, crispy on the outside and soft in the middle.
Aunties and Uncles (Lippincott, near Bathurst and College)
Not as thick as Butler's Pantry, but exceptionally sweet taste.
Eggspectations (Eaton Centre)
Softer but equally delicious.