What you describe is one perfect reason to consider leasing then buying. Yes, you will be paying more for the money you're borrowing by leasing rather than buying the car outright. But at the end of the lease you have options. And you're gambling with Infiniti's money - rather than your own - on what the actual depreciation will be.
If, at the end of the lease your buyout cost is $25K but you can buy a very similar, nice used one for $23K, then buy the used one (if you prefer it to your $25K one). Or, you can just turn in the keys. If the buyout is $25K and trade-in value is $26K, you have $1000 in equity if you treat it like a trade in, or you can buy the car out.
If you don't love the car, or there's a newer model with upgraded features you want, or you just want a new car again in 3 years, the lease makes getting out of it very easy. Infiniti and the dealership will make leasing/buying another Infiniti very attractive.
Plus, consider taxes. I'm not sure where you are, but here in California, Jerry Brown is going to take almost 10% from you when you buy a car and drive it off the lot. Now, Jerry is a nice guy, but he's not going to give you any of that tax back when you trade/sell your car in 2,3,4 years - he's just going to charge you tax on whatever you buy to replace it. On the lease, you're paying tax on the monthly lease payment, not on the total cost of the car.
So, if you know for sure that you'll be buying out the lease, then it is not a financially sound decision to go that route. However, if you want to minimize your risk, then it can be a great choice. Also, FWIW, if cash flow is important, your payments on a lease will be much lower than on a loan with similar down payment.
