Not downsize but upsize would be the decision for me. No thanks. I chose the X3 due to size. X5 was too big +heavy and with the then current generation 3.0D was far slower. The new X3 is bigger - 20d does look good and the 30d even better but I will stick to the 3.0D I have (AT issues beside) especially with the ECU remap - sheesh - scary now. With the new Nokian snow tyres amazing now in the wet and white stuff. So committed for a while.

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X3 E83 2006 3.0d