Peco's Bill when I am inside the park... not a bad burger, decent money, and nice fixings bar.
IMHO (there's the disclaimer) avoid Beaches and Cream.
My fiances mother has stayed at the BC and ranted about these burgers, especially how they were fresh never frozen. Well, things have certainly changed at Beaches. This was my first time there and as an overweight (well, not obese) afficinado of food I can tell you... it was frozen and flavorless. Not expensive by any means, but after the hype I was let down. Awesome theming though and great ice cream, but the burger itself... left me hanging.