I kind of like the black mags. I have the stock ones now on my '15 ATS couple. I ground the drivers side up pretty good a few months ago going thru a construction zone and some fool in a pickup tried passing me when I was in the left lane. He couldn't make the curve and forced me into those concrete barriers.Thank you kindly, the wheels are the gunmetal grey offered with Midnight Edition package. They look pretty dark until you notice the contrast from the black centre caps. I think almost every matte or gloss black wheel would look much better if it were dark grey instead. Black wheels end up making the car look like it's got snow tire steel rims on.
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I have to say the paint colour you chose looks terrific, and matches Cadillac polo green paint once offered on the STS. Look how great it also looks here:
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And for the green, I like the color. It's almost what I had on a 1993 SHO.
My current ATS is white/ivory and I kind of like it.
On a side note I got rid of the run flats. At 37,000 miles they were getting hard and rode like crap and made lots of noise on bad roads.