Won't you lose your shirt? If you've already had it for a month they are going to claim its value depreciated significantly so it's not like you are just going to pay a few grand difference for a Sport Line.
2015 BMW 428i Luxury Line Convertible - Imperial Blue/Saddle Brown
2014 BMW i3-REX - Andesite Silver/Giga Cassia Leather
2014 BMW 650i Coupe - Alpine White/Black Nappa loaded
2013 Maserati GranTurismo Sport- Nero Carbonio/Cuoio