Dr. Matt Irwin in Old Town Alexandria is known in the area for being the most holistic ped around these parts -- he even takes families who don't vax at all. However, my understanding is that he doesn't take insurance, so you'd have to file your own claims if I am remembering that correctly about him.
We go to Dr. Murphy of Murphy & Staats in Burke, which is not too far (we drive 40 minutes to see him). He is totally cool with delayed vaxing. I have heard of another practice in that area that is okay with different vax schedules, but I can't remember the name of it right now.