I have a 2004 XTerra. The gas mileage stinks, but it's comfortable, good power, nice stereo system, and it looks nice.
I would definitely go with the Nissan. I wouldn't buy a Ford for $5.00.
Many of my co-workers had Explorers, but got rid of them because of all the problems. 48,000 miles is about when a Ford starts to die.
The Nissan will last you a long, long time.