The original tires are 235 / 45 R18. I plan to run all season tires in the winter, on the OEM wheels, and I will likely go to 245 / 45 R18 for the next set. The 235s look stretched, which is not to my taste, and they leave the rims exposed such that curbing them is guaranteed. 245s should look and protect the rim better, have a bit more grip and, at least at the tire rack, they are cheaper and there are a lot more of them to choose from ( 4 times more choice).
From past experience, I’d probably get the Michelin Pilot Sport A/S on the sportier end or the Continental DWS for a more refined/comfortable ride (softer sidewall = sloppy cornering though). I had the Cinturato P7 and thought they were OK but not special at all. They also got horribly noisy as they wore down. I’m running the P Zero A/S Plus on my SUVs and it’s a very good choice for a year-round tire. Its weakest characteristic is the less than stellar wet grip (get the DWS for that), but that’s not critical in SoCal.