Ordering 3.0si this weekend - hidden costs?

[jcolem]

First of all I would like to thank all of you for the great information you post on this site - it really helped me figure out what options I wanted to go with. I've been searching for a new car to replace my existing 4x4 for over a year now, and have finally negotiated a final selling price on a brand new X5 3.0si. The final selling point for me - believe it or not is that I insisted my next truck had ventilated seats. For those who are fans of the option, you know that very few SUV's have this feature - and the BMW was the obvious choice given the competition (Escalade, Navigator, Lexus LX, Range Rover).

Details:

Space Gray
Black Perforated Leather
Dark Bamboo Trim
Premium Package
Active Ventilated Seat
Cold Weather
Tech
Auto Tailgate
Comfort Access
Running Boards
iPod/USB

The question I pose, is one of additional or hidden costs. Since I am paying for this car in cash, I'm wary of additional last minute options the dealer will try to add to the car once it is delivered. This is my first BMW, but know from experience that other dealers have always tried to do this on me before.

I plan on getting the windows tinted by the dealer - but that's it. Are there other things that I need to be wary of? Are there other costs that aren't evident on the invoice such as floor mats or other things that I will need to pick up the cost of as well? Are there other things I should consider given that I plan on keeping this car for the next 10 years?

Many kind regards for this great board, I look forward to posting pictures when my new baby arrives in April.