Best year?

[BubblesinAZ]

Good to read many folks favor a 2003 S, me too. We live in northern Arizona - the land of wonderful, nearly empty, high speed limit, excellent condition, two lane blacktop twisty back roads. If you ever visit our state, get off the highways and see the real Arizona.
Now to my real reason for joining in: I'm having the IMS quandary. Our Boxster has 30K miles, gets an oil change every 5K, and runs like a top. However; recently I have had a concern of the possibility of IMS failure. The more I read and research, the less I seem to be calmed. I've talked to the area LN engineering rep and he sez got to do it, while the Porsche Service Manager sez not to worry. Are there any stats/hard science relating to the probability of my single row IMS going south? What has been your experience?
Bubbles in AZ or maybe Befuddled in AZ