My first choice would be the mesh in option 1. It follows the look I am after closer. Option 4 is my second choice and would still look pretty nice with the car I think. If multiple people choose option 4 as the material they want their grill made out of I would not object. I dont know if the circular would look right on the car, would have to scrounge up a scrap piece and try to get a better visual (I can get very small scrap pieces of stuff pretty easy/cheap). Lets see what the rest of the group has to say and go from there.
Mild steel is the material of choice for me. Polishing mesh is nie on impossible and any of the rest of the options would probably have to be purchased pre-polished to make it look decent.
Thanks for taking lead on this little endeavor. Hope it works out for all of us!