I can't contribute much on the Cayenne. A four door Porsche truck doesn't actually interest me.
I have two friends who have them, (One standard and one S) they both love them and they are amazingly fast. I have a GMC truck that does everything I want a TRUCK to do.
I DO have a 1981 911SC that I bought 11 years ago and I've driven a little over 40,000 miles.
I'm still thrilled with the way it performs. I autocross it and take it to club "Drivers Ed" events. With over 100K on the clock it is absolutely reliable and solid as a rock.
I do my own maintenance and most of my own repairs. Most stuff is no harder than working on older american cars, It is generally simpler than newer cars. I don't adjust the fuel injection mixture (I don't have a CO Meter), and I don't do alignment.
I've owned and worked on a lot of cars. I haven't found much (beside newer 911's) that I like better than mine.
I take a lot of grief from "American" motorheads for this car. I thnk they just don't understand.