$1200 over invoice is not impossible.. especially on the 4.8 which sells but doesn't sell as much as the 3.0 model...

i would definitely get the following:
* premium pkg
* sport pkg w/214 wheels
* premium sound (because you can play DVD movies on the idrive sceen while parked, get 600watt amp, and more speakers) the DVD changer you probably wont use...(especially if you get the ipod option)
* Ipod/USB option
* rear climate pkg (which also tints the rear windows)
* tech pkg (a must have)
* aluminum running boards (not as functional but gives it the look you need)
* front heated seats (they work very well and the wife loves them)
* auto tailgate option (a very nice feature and because everyone's doing it, including Mercedes, Toyota, Honda, GMC, and even Ford, you might as well just for the bragging rights)

the rest is up to you...

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2012 X5 50i M-Sport
2014 X3 35i M-Sport