I had a good experience with Gary Lichtenstein at University of Penn in Philadelphia for GI issues and Tracy Hull at Cleveland Clinic in Cleveland for Colorectal Surgery.
While I have never been to a treatment facility myself. I have heard University of Chicago's IBD Clinic, Mayo Clinic and the Cleveland Clinic mentioned many times on this site and mostly positive reviews.
Hopefully those with experience will chime in to this question. good luck on your search!