I've always loved the shank on this one. If it came in the mouthpiece I use, I'd have one, but it doesn't unfortunatly. I keep looking to see if there's anything similar, but haven't found it yet.
Check out Horseloverz. They have tons of nice show bits for a good price, as well as several mouthpiece options. I personally go to a dogbone as first choice. If the horse doesn't like that, then I'll try some different ones.