Woody my man, life is definately too short. I am very sorry to hear about your wife, having an ill spouse cannot be easy. For either of you.
I will tell you, 4 years ago my mom was diagnosed with terminal leukemia. 3-5 years to live. My parents said "thats it, pull the plug on work", retired (they were both 55) and now live it up. They go to mexico for two months every winter, my dad bought a new harley which they go riding on, and they spend all their time together just having fun. If they spend every last dime and more enjoying their time together, i say go for it.
You never know what life will bring, money comes and goes, but time is only given once. You will only get so many years, so stretch the cheque book, and get the car, have some fun, spend it together. Dying poor, but living well is not a bad thing.

And heck its just a car, if you dont think you can afford it later, you had some fun, you sell it off, eat the debt, move on and stay happy.