The engine numbering refers to the power output, with the D2 being the lowest powered and the D4 being the highest powered.
The D2 up to 2015 model year is a 1.6L Ford/PSA engine and from 2016 model year the D2 is a 2.0L Volvo built engine.
The D3 and D4 are both 2.0L Volvo built engines. The D4 up to 2014 model year and the D3 up to 2015 model year are five cylinder engines and the later versions are 4 cylinder engines. I would consider a 5 cylinder D3 in a 2013 to 2015 car, the 150 bhp engine will be powerful enough and should be reliable.
You want the Nav version for sat nav. All versions have stop/start and all but the base model have cruise control. The SE Lux will be the best spec.
Hope this helps.
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