BTW - I wasn't expecting too much love from the X5 BMW crowd towards my Audi, which is part of why I posted this here to get some alternate perspectives from people who have owned or do own some of the cars I am considering.

I just had a thought too. Maybe I should DD the X5 for a month and see how I like it vs the S4 and see if that gives me any alternative perspectives on the matter.... If I were to sell the S4 instead of the X5 I would probably be most inclined to get an E46 M3. In that scenario I could see myself driving each about 10-12K miles / year which is a manageable amount of miles for both cars.

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2003 4.6is - SOLD
2003 M5 Imola
2008 Mini Cooper S
2011 Mazda CX9