Bob's Tire and Auto in Lewisville has a body shop. They can handle anything there from a ground up restoration to dent repairs. Stewarts is also very good, they are in Dallas, mostly do high line and exotics there.
I believe that soon-to-be-opened Sewell MINI/MINI of Plano is already doing MINI bodywork. Many people also have had good results with Bankston, who MINI of Dallas uses. You can also try searching or asking for recommendations here.
