I think your wife is right. Let things settle a little bit. In the mean time you can learn a lot about the car here on the forum and save some money for the down payment. Z isn't going anywhere. 122 inches of snow is a lot! We barely get 10" (1 or 2 snow days) here in jersey. 370Z is horrible in snow. You can try getting snow tires but I think you may need to get a beater vehicle or use public transport (during those snow days)
Welcome to the forums and thank you for serving our country