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I've used both Hennessy and Perimeter (formerly Jim Ellis) Porsche with good results.
Just make sure you book it when they are not super busy so you can have more time discussing with techs if needed.
If you want a non Porschce dealer for your PPI then I would highly recommend Freed Performance in Cumming. Sean Freed is the owner, worked for Hennessy for years, is Porsche certified, uses only Porsche parts, Motul oil, etc. Once you buy your PCar I would check him out. Many within the PCA community use and recommend him for their service and performance tuning needs.
Jim Kimmey at European Import Services. 770.932.5267. Specializing in Porsches. Great guy. Very honest and great mechanic. I use him for the things I can't do.