While it's a pretty good trek from Dallas, a trip to Advanced Motor Sports is always fun if your into Ducatis. There's race bikes there... Casoli's supersport winning 748, Hodgsens HM Plant 998, Bayliss's 2000 998, along with older Duc's that the true Ducatista would appreciate. The owner is the coolest MC shop owner I've ever met....Jeff Nash. He'll talk your ear off on just about anything MC related. He's an AMA champion (Pro Thunder I think...not sure of the year) and currently on the AMA board, so if you like to talk racing, you can easily spend days there. It's a small shop, but way cooler than your average MC shop. Unfortuantly, it's way out in the sticks....by Red Talon's place actually
Here's the website
AMS
Other than that, I would second Motoliberty...other than that, everything is just multibrand cookiecutter dealerships for the most part.