Nice car OP, i like the way the skirts look but just dont like the finish and the fit of them. Best upgrade i have done to both my 200s is projector headlights. The standard lights are very poor. I like the black spoiler as well, garage told me it was too late when i ordered mine.
If you are looking for a good cleaning product thats nice and easy to use and not to bigger hit on the wallet i would suggest Werkstat Jeffs Acrylic Jett Kit. Brings out the silver really well.
Thanks very much, and yeah I know getting the side skirts gloss black same with rims black to, and the side f the spoiler silver and putting hids in the front and blackened led rear lights, blacker tinted rear windows, and nope 21K!! Bad hey haha