Robinson isn't anything very special, but Austin is very good when he's healthy. Coupled with Witten and Dez Bryant, who should be ready to break out this year, Romo has plenty of talent to work with. Now, about that offensive line...
I tend to be a Romo supporter because it seems like he's running for his life quite often. Plus, props to him for having to put up with the circus of TO, Jerry Jones, and Dallas in general.
I'd take Rivers over Romo though.