You didn't ask for advice as it was too late, you already made your decision. Owning hi line cars like BMW's etc, cost real money. Your Porsche is a good one, the X5 you had isn't necessarily a bad one, it may have had some teething problems that may be smoothed out for years to come. In the end, there is always a cost of ownership and the value one perceives is truly theirs to determine. If you liked the vehicle, a reasonable alternative would be to trade or sell and buy a new X5 and always be covered under waranty. If it made you uncomfortable, you made the right decision.

To me the cost of the items you cited is measured in down days of vehicle availability. You cannot measure them in real dollars because they cost you nothing, outside of the inconvenience in dealing with them. Does the fact that you experienced these issues suggest that the vehicle will not be reliable in the future? Not necessarily.

While you have made your decision and are obviously happy with it, it fits yours needs and you are comfortable with it, than all is good. I believe many here would not even consider such an alternative (perhaps an MDX?).

It comes down to the experience and feeling you get from driving a particular vehicle and ones wilingness or ability to pay (or not).