I've had an X3 without either the servotronic steering or the premium sound. I now have an X3 with both, and can't image how I lived without them before! I will admit the servotronic steering takes some getting used to, and I initially didn't like it. But it has proved invaluable especially in the parking garage at work.

Privacy glass: Find a reputable tint shop in your area and get an even tint on all the windows, which looks a LOT better, IMO.

The 'phone cradle: If you have a Bluetooth enabled 'phone, you don't really need a cradle unless you want to charge your 'phone on long road trips, for example, or unless you like a clean look, and would like everthing integrated. You should realise that if you do install the cradle, you lose storage space in the centre console, which is not necessarily a good thing. In addition, should you upgrade your 'phone, you may also need to upgrade the cradle, and that can get expensive.

Aux input vs. ice>Link Plus: There's no competition here. Get the ice>Link Plus. I've had both (the aux in my "old" X3, the ice>Link in my current X3), and the ice>Link Plus is a much better choice. It allows COMPLETE control of your iPod using the steering wheel controls, which is not the case with an aux. input. The only reason to get an aux input in addition to the ice>Link Plus, is if there are MP3 players other than the iPod which will be used in the car.

If I may suggest adding one more option: The steering wheel warmer. You'll wonder how you've lived without it, and when winter rolls around, you'll thank me!