Every now and again, it pays to go back to basics. Which is precisely what Nissan did with its new Xterra SE SUV. The result? Buyers have practically tripped over each other on their way to dealerships. While other manufacturers are scrambling to provide customers with the latest and greatest - electronic all-wheel drive, a finer grade of leather upholstery, and megawatt sound systems - Nissan lashed together a rigid frame, four big wheels, and a body with a backpack's practicality. And at an incredible price: You can roll out a 4x4 Xterra for less than $20,000. Add on a wealth of goodies and you're still a far cry from the $30,000-plus that most of the midsize sport utes cost.