The X5M is in another league compared to the other models. Plus you're opening a whole 'nother can of worms when it comes to maintenance. I've driven one a few times, and don't get me wrong, they are a beast. I'd probably pick it over the Porsche Cayenne Turbo. If you want some sensible I'd either get the MDX or the X5 3.6D as said above. PLENTY of power. Good MPG and those diesels will run forever.