My favorite features in order (US model)
1. Comfort Access (a must)
2. Active Ventelated Seats (you have to try these, amazing)
3. Tech Package (I cant live w/o this even though it has shortcomings)
4. HUD (really is usefull)
5. Sport Package (for me the ride is far better than non-sport w/ sport mode turned off)
6. Premium Sound
7. 3rd Row ( even though I will only use it 2-3x's per year)
8. Cold Weather Package ( didnt think I needed heated steering wheel, but I really love this feature)
9. Rear heated seats ( you will probably use these alot more than I will down here in Louisiana).
10. Rear Entertainment ( I didnt want this feature, but the kids love it...now I have to buy it for the wife!)

Hell, just get everything....its only money. That way you wont second guess yourself later. BTW- I really love the Panoramic moonroof, but reality is I keep it closed all the time because the sun is always in my eyes and it heats up the interior too much.

EDIT- regarding rear camera, I wouldnt get another vehicle w/o it especially if you have kids. It also makes parking much easier.

EDIT2- The Sport Steering wheel is awesome...be sure to look at it. It is much thicker than the normal one and feels great in your hands. Obviously not enough alone to justify Sport Package, but is nice nonetheless.

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2013 X5 35i M Sport