Depends on what you really want. The Ford emgine sould get you weel over 100,000 miles if properly cared for. My expedition has 103,000 miles on it and I don't plan to get rid of it anytime soon.It still runs as well as it did on day one. If you want new and you are still happy, I would wait for prices to drop and supply to replenish. If you really want something else, and are willing to get something used, the I would be taking my time shopping, and if the ideal thing popped up and the finances were right, then go for it.
Only you know your deep seated needs, dreams and desires, and the price you are willing to pay for them - in time and money. Weigh (on paper) the pros and cons for your situation.