I would change:
Non-factory tires - OEM tires are terrible and only good for fuel economy. They don't handle well on dry pavement and are abysmal in snow. I'd request an $800+ credit from the dealership and get better all seasons from Costco, or a set of summer and winter tires. A friend upgraded his tires and is very happy. He selected the best all-seasons Costco had available at the time.
Bigger Battery - OEM is terrible. I'm unsure if they fixed the issue, but after 3 free OEM battery replacements, I installed the largest battery, I think AGM, that would fit in the compartment and never had a problem again. Sitting in the cold overnight was no longer an issue.
WeatherTech Floor Mats - add the WeatherTech trunk liner if your dealer didn't force you to take an OEM one
Auto Stop/Start Eliminator - $100 to eliminate the annoyance forever