The less asshole answer is: Buy the car you want, and you're being a fool if you think there's going to be a reasonable resale market in less than 20-30 years. It's also foolish to buy a car as an investment.
You don't need phone flash to flash maps. You just use your laptop. PhoneFlash is very new and most folks don't use it. Hell, I have it and I've still never used it.