I highly recommend Pro Imports in Rockville. They've done all of the alignments on my track prepared e46 M3 which has camber/caster plates and rear adjustable control arms so they can handle any type of an alignment from simple to complex.
Also, last week I had them install my PFC BBK on my e92 M3 and the install was performed flawlessly.
There number is 301-881-5055 and ask for Pat. Tell him that I sent you to him.