Georgiev, i have a 4.4i and love it to death. Although, i wish everyday that i had the extra coin to get the 4.8is. With my 4.4i i've had the intermediate levers fixed, new transmission replaced under warranty (thank god) and of course the usual maintainance. If money is driving your decision, you may be better off getting a lower mileage 4.4 rather than a higher mileage 4.8is. Obviously the best would be a low mileage 4.8is though.

Enjoy the car, and whatever decision you make, guaranteed you'll be happy with the X5

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BMWCCA