Your alternatives are also,
A Audi Allroad Quattro (get the station wagon model (the avant) if you plan to use for long ski trips.)
It doesn't even need to be the all road, it could just be a quattro avant..

Also, with that much mileage being put on the car, why not go with something preowned.
I owned the Infiniti FX45 and I think your family will be disappointed with the interior space after driving an X5. It is not any where near as comfortable.

And, if I were buying a "non sporty" SUV right now, I would be buying either the Lincoln Navigator or the Cadillac Escalade. I know people on this board don't like them but, I have driven both. And if I didn't care about performance, this is what I would be driving. They are SOOOOOOO comfortable. I think the Escalade is much better looking from the outside but the Navigator is nicer inside.

Good luck.
B

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"When two people agree on everything, one of them is not necessary" - Arliss