For the OP: My only concern with having a higher mileage vehicle in your case is your geographic location and the resulting salt exposure in the winter. The chassis photos of northern vehicles I've seen posted often show some significant corrosion on fasteners, fittings, and pipes. I'd be sure to perform frequent underside wash downs to minimize the effects from the salt. Other than that, with proper maintenance, "the ground" is a long way off for these engines.

2002 X5 3.0 278,000 miles
2004 325i 120,000 miles