Ironically the painted Silvia light looks better than any of the others. The Chargespeed grille doesn't look bad painted. The rest of them just look goofy. Don't paint it white.
I don't like the looks of the GTR grille with the Silvia front, period. It doesn't mesh with the rest of the front end, sticks out too far. I know it's a popular mod, I just think it doesn't flow. The Chargespeed actually looks pretty good. I might go with that if I had an aggressive front end.
I say just do a wire mesh painted black and recessed back two or three inches, just to keep it from looking empty.