Hey man,
I had a very similar dilemma. Did you check out any of these colors in person?
The only three colors I've seen in person happen to be the ones you've listed there.
You're right, the Argento shows off the lines really well. However, the pear white also does this... and compliments the design and the shape of the car slightly better than the Argento. However, the pear white lacks the shine and classiness of the Argento. (Don't get me wrong though, the pearl white still looks classy... but I just think the Argento shine one ups the pearl white there)
The Asphalt is like a totally different car. The lines are not shown as much, and the design doesnt display well in pictures. This is definitely one of the cars that you MUST see in person. After taking a picture of this and comparing it with the real car, it was like I was looking at two different cars. The design is shown off a lot more in person. For some reason this car LOOKS smaller than the Argento . (I remember overhearing a dealer commenting on how the Argento looks bigger than the Asphalt to another customer too.. so it's not just my opinion alone) The Asphalt looks "dangerous". When I sat in the Asphalt and test-drove it, it almost felt like this car should be bought only in Asphalt. But I could be wrong here... cause I didn't test drive any of the other colors.
I ended up picking the Argento :P
My dilemma was between the Argento, Firestorm and Asphalt. I didn't get to see the Firestorm in person

. But I saw the white-out in person just 2 days ago and I was surprised at how well the design of the car was shown off.
I would recommend going with the Argento, it seems to have a mix between what the White-out offers and the what the Asphalt offers