Those Forgiatos are very nice for a 750, but in my opinion the Alpina wheels are perfection and are also a defining characteristic of the vehicle. I would personally not change them.
I do agree that the roof spoiler would be a nice upgrade. I would go gloss black roof spoiler with the gloss black roof.
In the end what really matters is that you find your car aesthetically pleasing. When you are walking away from your car and you can't help but turn around and look back every time you know you have done the right thing!