Mine is in the shop right now for paint. I must have went through so many shades of grey and silver that i'm sick of looking at them. I have a color picked out but it's a surprise
I think out of the ones you have picked out i would either go with the black or grey. I love the flat black look but like so many have said before, most people just see "primer" and it loses the effect that a Lamborghini has with the same paint.