Mike,
I go to a place in Durham. It's on Hwy 70 and he's a Tire Rack certified installer. He has a great alignment machine. Here's his contact info:
http://www.tirerack.com/installer/InstallerDetail.jsp?index=1&addressAdmin=false&zipCode=27278&installermiles=9
The Digital Chassis. A little pricey, but the owner and main tech owns a 928 so he knows what he's doing.
Carl