Five-year cost to own: $73,826. The big and bold Infiniti QX80 is as rugged as it is luxurious, and while the most expensive to own in this list, it’s the most affordable model among what are some of the costliest SUVs on the road. A 400-horsepower V8 engine delivers energetic acceleration, with a maximum 8,500-pound tow rating. With myriad upscale features included, a sophisticated suspension helps give this behemoth better than expected. ride and handling characteristics.