I had the same dlillema. Had a 535 loaner, went to go run numbers on it. Saw the 550 and drove that and... Well the rest is history!! The price is too close to not go all the way. Like others have said the 550 is extremely fast considering its size!! 550 gets my vote! Good luck
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Past: 2011 E92 //M3 SSII DCT
Previous: 2012 F10 550i Carbon Black M Sport
Present: 2017 430 Gran Coupe
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