I'm looking to buy new SUV and can't seem to pull the trigger. Have narrowed it down to X5 35d, Cayenne S, and Range Rover Sport Supercharged. Every car has pro's and con's. Loved the torque/drive of BMW. Biggest downfall is dated interior/exterior. Worried that even the premium audio is only mediocre.

1. Anyone have any words of wisdom comparing X5 to other cars on my list?

2. Anyone have relatively simple upgrade for audio?

3. Any idea when they're updating this model? Would be bummed if bought new and then suddenly had obsolete model.

Thanks.