thanks for the response and the details on the maintenance schedule you hold yourself to. It certainly makes sense to me.
I still think the dealer's remarks are fishy. If he'd said that he recommends an oil change every year as a precaution I would get that. However, the fact that he's saying service intervals for the Cayman are 1 year or 10,000 miles does not match any manufacturer documentation that I have seen or obtained from guys at PCA.
Just to be clear, I make a difference between an oil change and a service. An oil change alone is NOT a service and, in this case, an oil change alone is not what the dealer recommended.
I think I'm going to go with the Indie shop, do the major service and the spark plugs now. Considering the dealership gave me a three year old A4 with broken sun visors as a courtesy car last time I got a service done there, I don't think I'll be missing much of anything...