I'm a fan of Bulldog. I haven't tried too many of their drinks yet, but their lattes are quite delicious and the latte art they do here is unreal! My favouite, by far, is the Mocha Marshmallow latte... I can't sing it's praises enough. It tastes like you're drinking the melty marshmallows from the bottom of a hot chocolate.
The only downside here (for me) is that they are cash only: I don't always have enough cash on me for a latte when I'm walking by, and will continue down the street to Starbucks instead if that's the case.