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If you don't know, then just go for the 650i. An M6 is too heavy to be considered a track car and if you're contemplating, then 18K doesn't justify the extra horsepower that you'll have during highway cruising.
Yes, it's more visually appealing but the average person doesn't even know the difference between a 640i and the M6. Get yourself a nice 650i M-Sport, put a tune and some visual mods on it and you'll be just as happy with 15K more in your pocket.
Typically I say if you have to ask the question, then you're not a big enough fan of the M to make that difference worthwhile.
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