It sounds like you have an inheritance that can pay for the QP in cash, that's great but I was trying to answer your question based upon what you orginally said. Someone with an annual salary of $60k ($120k HHI) is just not enough to afford a $120k automobile. If you can pay cash with someone elses money that's different and since your home is paid off you've probably got more disposable income than the average Joe earning $60k/yr.
It's all relative but don't be fooled into thinking that becuase you're looking at a new car that the cost to maintain it will be minimal. Like you said, there are service intervals that need to be met, tires are a frequent and expensive proposition plus you've got the obvious costs like fuel and insurance too. Honestly, I would budget roughly $3k/yr above and beyond the stated costs to maintain a QP, they are not cheap.