Paul Miller is the largest, steve Siegal is the man! Typically unfrienly staff (not Steve) and not very knowledgeable (wanted to service my Q7 shortly after it came out and receptionist did not know what a Q7 was).
Audi Millburn/Bernardsville are unbelieveably friendly and forthcoming. Smaller dealer, smaller allocation. I would suggest order now, it will take at least 9 months untill you get it.