Diesel mechanic

Whats up? I own a '99 6.5L diesel 2500 suburban and I am looking for a reliable shop or mechanic that knows these engines well. I live in the northern virginia area and currently go to the dealer for most of my service. They aren't bad, but they are high volume shop and don't seem to be able the take the time good service needs. Anyone that may have any info would be greatly appreiciated.