60K is not that much mileage on an X5; it's a vehicle that can easily take you to 150K. Aside from the usual BMW foibles (water pump, fuel pump), there should be little drama in keeping and driving the X5 for another couple of years.

IMHO, none of the aforementioned vehicles is better than an X5. The only value I see is possibly more cargo space and a 3rd seat, but nothing beats the X5 among SAV's for the pleasure of driving.

But if you're looking looking to get something that doesn't suck up gas, may I suggest a test drive in a BMW 535xi or 530xi sports wagon? Yes, I am kind of biased because I own a 530xi, but it is probably the best all-purpose vehicle that I've owned. It's a great vehicle for a 2 child family, yet it handles and performs very much like a 5 series sedan.