I've only had one professional fit so I've little to compare to, however my brother is a strong rider and has had multiple professional fits. He recommends Gear West Bike & Triathlon in Long Lake, MN in the SW metro:
Bike Fitting - GearWestBike
It looks like the owner, Kevin O'Conner, is one of two that do bike fits, his bio shows a B.S. in Exercise Physiology, Iowa State University. The link to their bios is near the bottom of the page.
Neither I or my brother is affiliated with Gear West in any fashion, in fact I've yet to set foot in their store.