I will put a question mark on supercharged engine since somebody tells me that supercharged things are not reliable. You need to feed it with #91 as well, as I remember.
If you won't have too many off-road experiences, don't buy Xterra or Liberty. You could go for high-end car-based SUV or just a car like camry, which is at the same price as Xterra. Those alternatives give you more fun in the city.
If you still like it, just remind you to choose the audio option. It seemed that the 150W speakers should sound better than the standard one.
Anyway, like Honda_odyssey said, go and try it.