Can anyone tell me what is best to do.

paint them just black....

or

get them powder coated black...

what would last the longest yet look like i bought it from mini.

Im not much of a chrome guy and it bugs me to see this chrome.

thanks for your help xD

 

I would go paint. The grille is plastic and there are several paints made for painting plastic. Do some searches and you will find lots of examples on NAM.