I live just a few miles from there. Dr. Sandborn is one of the premier IBD docs in the country - but that's not always a good thing! He does lots of research and can be hard to see as a patient. But they have a good team there with other doctors besides him.
UCSD, Scripps, and Sharp are all very close to Clairemont (within 5 miles) and all have at least a couple of good IBD docs, so I think you'll be ok to start with any of them.
I started out at Scripps (due to insurance pushing me there), then moved to UCSD when my insurance changed and the new one pushed me there instead.