Thanks for all the suggestions.
So I visited both Porsche specialist shops and both seemed very knowledgeable and friendly, but now the issue is one shop charges about the same hourly rate as the dealer, and the other is actually 15% higher than the dealer. I'm looking to have my wheel bearing replace (3~5 hrs) and in this case I think it's more logical to go to the dealer as it cost about the same as the indy (or 15% higher at the second indy). I was hoping to built a relationship with a good Porsche indy shop but with them charging the same or more than the dealer it's a hard sale. What do you think?