If quiet is what you after, maybe you should consider 5 series.
My F10 5 Series cabin is so quiet, I almost fall asleep every time I drive the car.
People are calling this gen 5 series a Lincoln lol.
The F30 3 series are almost priced the same as 5 anyway. ($40k for 328/528, $50k for 335/535)
2011 535i Alpine White, Oyster on black interior, Premium 1 & 2 Package, Magnaflow Full Cat-Back Exhaust, JB4 Stage 2