Fleurdelys Patisserie has to be one of the most under-rated patisseries in Toronto. They never have crouds like Rahier but their stuff is amazing (though they don't have quite as much stock or choice as Rahier--likely to keep what they have fresh). The almond twists are fantastic and the chocolate desserts look (and taste) a lot like the kind of things you can find at Senses--but I'm pretty sure the cost is lower. Truly, this place should be way more visited than it is.
They also make a nice mocha which you can drink with your pastry at one of their three tables in store.