Hi Benjamin,
The X350 is a luxurious good looking car, I think that`s a good choice.
When your family has grown a little, and they grow up fast, may be then look at something else if you still feel you would like a change.
If looking at cars I would advise getting RAC / AA inspection even at a dealer its really worth the money.
Unless you are a bit more mechanically minded than I am , still learning.
I would always have inspection as had trouble in past.
Kind Regards,
Julie.