Tim Ober is fantastic. For all of his involvement with the high performance crowd, he takes every client and every horse seriously. Great bedside manner. He does go to Florida after Thanksgiving, so you might not be able to catch him. Less prominent but a good vet and dressage rider is Martha Mellish at Keswick Equine.
I know my regular vet thinks the world of Tim Ober, so he might be a great choice. You should also look into Old Dominon Equine. Dr. Beshear did a PPE for me a few years ago and I thought he was great. It was a pretty basic exam (no xrays), but he was thorough in his flexions, and gave me a very detailed and helpful report. I'd definitely use him again if I was in the area.