Magicgreg
I took the plunge on a Cayman S in December last year. I have to say it is by a long shot the best car I have ever driven. Everyone knows that when you own a car like this, you have to expect high bills for certain things, but the pleasure of driving (and looking at yourself in a shop window - come on, we all do it!!!!) far outweighs this.
Enough has been said about the acceleration and handling of this car, and I can confirm it is spine tingling. I suppose I am well placed to compare the Cayman S with the Z, and I have to say that the Cayman is put together way better. The build quality is second to none. I still have my Z, and it is impossible really to fairly compare both. The cabin is rattle free, and the doors close with a satisfying thunk - this was always my biggest gripe with my Z, the tinny doors. The acceleration is just never ending and it pulls away in 6th like you wouldn't believe.
I have had more looks and comments in the Cayman in 3 months than I did in the 7 years in the Z. If you like that sort of thing you will love the Cayman, I have had loads of people comment on it while I am filling up at the petrol station, a place I frequent regularly......
As far as running costs are concerned, I get around 24mpg around town and I can hit 30mpg on a run if I don't rag it and put the cruise on at 75!
Servicing is noot as bad as you might think, with 20,30 and 40k services costing around £2, 3 and £400 respectively fom an indy.
I have never experienced any tramlining and although with the 19" wheels I have the ride is hard, it is never harsh, and it thuds over bumps in the road rather than crashes over them, however I do avoid certain roads in cardiff due to the pot holes. The standard 18" wheels will obviously improve this a little
Overall I love the Cayman and I agree that you need to go for the S (3.4) over the standard model. It drives beautifully, looks incredible and makes me smile everytime I am behind the wheel.
The only caveat I would put on it is to buy from an OPC (Official Porsche Centre) as you will get a full 2 year manufacturers warranty. I have already made good use of this (That is another long story....!) however Porsche in Cardiff were amazing. The car will also have had their 111 point check which gives you peace of mind.
If you have any more questions, I will be happy to help. Send me a PM with your email if you want and I will do what I can.