Very nice writeup. I have gone through the same deliberations many times, and no matter how expensive or how exotic the competition is, there just isn't any car in the world that is better than the M3 and M5. BMW have really got it right, and they stand alone in the auto industry.
Congrats on getting the M5, and doing it so quickly. I think it is cool to make a quick decision and go for it. Instant gratification
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Cheers.