Razzy Fresh was my first legit frozen yogurt shop experience, and nothing can top it.
I've been to 3 of the locations and none of them were ever less than fantastic. All of the locations have about 15-20 flavors to choose from, with a well stocked topping bar. Of course, some of the flavors are always available, while some of them rotate and you can go in and find a brand new flavor to try.
My favorite combination which my friends and I stumbled upon was Triple Chocolate mixed with Salted Caramel Pretzel. It is as majestic as it sounds. Obviously the toppings are up to you, but do not sleep on this combo. The Triple or double chocolate is always available in my experience, but the salted caramel pretzel could be considered rarely available. If I was lucky enough to be there when it was, I immediately notified all friends within a 10 mile radius.
If you live nearby and like some frozen yogurt, get a punch card. I believe if you get 9 punches you get your next 12oz. free or something like that. Plus all of the managers are nice and occasionally give you a double punch.