I would opt for a polished gel coat finish, painting for the sake of having it a certain colour isn't carbon foot print friendly don't you know.....
Besides the cost of having it painted would get the car on the road so why bother!!!
Some kits don't give you the option of gel finish due to the way they are made but I don't see why as folk like Ultima and GTM make very techy shapes yet they are a polished gel coat finish.