Karrie is the best. Been working with her on projects for years now.
Even then it took me years to finally get around to getting a fit done. She's attained the highest level of accreditation through Specialized. I have been riding and racing since 1988 and while I was already VERY close I was still off. Her changes have made it completely night and day perfect.
I have heard great things about Bob over at wheelwerks as well. I have also heard some mixed reviews. Cyclepsycho on here has had a fit from him and then one from Karrie so he might be a good reference if you're interested.