Based on your concerns about room and also your need for the latest and the greatest I would recommend you stick with your original thought and go with the 760's. Your state may even have a buyer's remorse law allowing you to bring it back up to 15 days after signing.
Either you will enjoy the car and keep it or have a great story to post about bringing it back and "test driving" a 750 for another 2 weeks before ultimately going to a Mercedes.
;)
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