it is sad that you go, but to be honest, the most important thing is, making an informed decision... If you noticed, the X5 is called SAV, as there is not much of a Utility in it... as a matter of fact, i have heard that E39 station wagon (universal touring) has more utility than the X. of coursr it will do fine, towing upto 6000 lbs with proper equipment, it will haul 4 adults with comfort, but it is still a sports car (on growth hormones... lol) you would not expect this utility from a Corvette - and the beast you were looking at, the 4.6iS is a capable contender to the Corvette...
still plenty of time to research...