I was in your same predicament a couple of weeks ago when I had to replace my front bumper. I was thinking of painting mine silver like the rest of the truck, but to me it did not seem like it would match up with the regular grille. I figured it would look out of place to have it painted. IMO, I would mask it off and leave it black.
I would suggest though maybe posting a picture of the front of your truck in the photoshop thread and see if someone can make the bumper grille body colored for your truck. That will give you a better idea of how it will look.
