While Fage is my yogurt of choice it is kind of spendy.
You can make a pretty decent faux Greek Yogurt by buying the 32 oz. container of Dannon Plain Full Fat Yogurt and placing it in a paper towel lined strainer over a bowl and refrigerate. The liquid will drain and you will be left with rich, creamy Yocheese.
I like to flavor mine with anything from fresh/frozen fruit, SF flavored syrups, jam, shredded coconut, etc.