I have a couple of weeks to make changes to the initial spec on my 750s. I have narrowed (so i think) the color down to one of three mentioned blues in the title. I know there have been multiple threads on this subject but none have really said what the actually differences are. Unfortunately I have never seen any of these colors in real person and my closest dealer is 2 hours away has nothing in stock to look at. I have seen color samples and studied every picture there is on the internet including the great work done with the photo album over at San Fransisco Mclaren. The colors look so close to me that I think I am going to save the 9k and just pick Aurora, unless there is something about the other blues that warranty the upgrade. Side note. I love Paris Blue and have seen it in person, however I really miss the metallic flake that is present in the other choices.