Are you looking to change the color of the entire exterior? If so, then I'd go for a matte wrap of your choice (about $2grand). But If you just want to black out some things, the kidney grills and all the M6 badges (fender and trunk) could be a start. There's really nothing else you can dip. Anything chrome would look better in black.
Whatever you decide to dip, bear in mind that when it comes time to remove...it ain't that easy. On the other hand, wrapping a part or the whole vehicle, de-wrapping is much much easier.
Not sure what you mean by what surrounds the grill. Do the entire grill black. Here's a pic of what I'm talking about. You can use it to elaborate more on what you meant.
That isn't my car, I just found it off google with the black kidney grills on grey color since thats what YOUR car will look like finished.
The lip makes the look of the car. It's a Vorsteiner front lip replica. you can snatch one for $275 or so on eBay.