I'd go for the xterra if you are interested in maximum performance, with its 4 litre engine in a car lighter than comparable competition. Besides, when it comes to service, I have been most impressed by the nissan service centre, which i know because i go there with my 2003 Pathfinder, and i am pleased with the price, quality, availability of locations and speed of service.

And no, i don't work for them! :-)