Clean (not my style, but very very well executed).
Any reason you went with drilled (well, knowing brembo, cast with holes then cleaned up hopefully) rotors tho? 
Let me know how your HPS pads do in the rain after a couple months of use. When I first got mine they were fine but now the initial bite in heavy rain is horrible. You have to get on them pretty hard to get any braking, then suddenly the friction dries them off and they bite hard. It makes smooth quick stops in heavy rain pretty difficult. Slotted DBA 4000 series rotors.
I wanted slotted but the only ones I could find were ebay no names that I didn’t really trust.
UCC had a 2 piece that was like $1,200 for the set and I am not tracking the car so 2 piece did little for me.
So it was either OEM Brembo blanks or GM performance parts Brembo drilled. The price differences was not excessive, I like the look and there might be some minor benefit.
That’s weird that the rear rotors would be larger than the front. Anyway, nice car and great upgrade. The CTSV is definitely hot.
Other mods include: Corsa Exhaust, B&M Short Shifter with solid rubber bushings and CAGS removal.
Appearance stuff: 3M PPF, 50% Tint, WW Smoked Sidemarkers, LED interior and exterior lights.