I am looking for a very good shop that can perform routine maintenance on my car. I am located in the Philadelphia Area. Any advice?

if you want an infiniti service shop:
Ardmore Infiniti does a good job.

I have been to Ardmore. Charles Curran is the best, but the others are sub par.

Any others?

What kind of maintenance? If your looking for just regular service then Holman Infiniti is pretty good. They're in Maple Shade.