E55 Cost of maintenance

What is the cost of maintenance of a 00-02 E55 with about 60k miles. I am considering buying this car and most of the car is out of warranty. I want to have an idea what will be the cost to upkeep this car besides from normal maintenance like brakes, oil change, tires etc.

I am looking into cost of the parts and service that will have to be replace soon on a E55 with 60K miles such as:

New AFM
Timing Belt change (if E55 has one)
Misc Electronics sensor and modules
and anything else that can go wrong on a high mileage E55.

I have own an Audi and BMW and I have spend quite a bit of money to replace many sensors, electronic module and mechanical parts in order to keep them working good after the factory warranty expired. I try to avoid spending thousand of dollars to fix numerous problem on the E55 if I happen to own one.

Thanks

BC