Year ago also was debating by between 550 540 , x3 m40, 340 gran coupe. I was leasing and my 550 was only $150 more per month vs 540 and I never had V8 car. 3 series felt less refined, more noisy on highway, I needed more room in rear for car seat and bigger trunk. x3 m40i was probably the closest to what I wanted but v8 won.
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