By far, the most accurate and honest mechanics I've used work at Foreign Accents on W. Market St in Greensboro. They're cheaper than almost all the dealerships in town, and their oil change prices are actually cheaper than the Jiffy Lube places. Randy and Scott are the two brothers that own it - really nice and honest guys.
One time my car was making a noise and another mechanic quoted a few hundred to fix it. Randy said "Almost all Passats from this era make that noise. It's nothing to worry about and won't cause you any further problems."
Talk about honesty!