Nice pickup on the 4.6si. There is a local guy here selling a 2002 4.6si with 88K for 18K. He originally listed it for 21K last week and seemed to of dropped the price:

2002 BMW X5 4.6is

Is there much of a difference between the 4.6si and the 4.8si. I think it is like 25HP of so but that is probably not that much of a noticeable difference? I may go look at the 2002 this weekend as the guy seems like he needs to sell quickly which is why the instant reduction in price. Just a bit scared to spend around 20K on something with no warranty and high mileage. Have a 2000 Mercedes and know what maintenance and such runs on these type of cars.