If you don't mind a bit of a drive, I recommend Dave Jay in Ewing. He is an independent Mercedes Master Tech and is a very cost-conscious and very capable guy. He uses rebuilt/used parts whenever practical and does ist class work. He overhauled the A/C system on my 82 300Td...INCLUDING a new compressor and cleanout of the blower unit and its ductwork (which tend to deteriorate with age and shed particulate matter which impairs airflow into the cabin) for about $1000. Also overhauled the entire brake system, including calipers, vacuum booster and M/C plus pads for under $750.
Plu, he's really busy all the time, and a really nice guy!

Best,

Frank