Check out my thread with my HID retrofit. You can buy a set of sealed beam H4 conversion headlights with a clear lens for 30 bucks, and bang out a retrofit in about 2 hours.
Your other option would be to wait until they come out with a sealed beam to projector conversion OR drop in a set of JW Speaker LED headlights, which are crazy expensive (expect to pay around $800 a set).
If you decide to build a set of projector headlights, this is what you would need:
Select H4 on the wiring harness, Morimoto 3Five 35W ballasts, either 4300 or 6000k bulbs (4300 is factory white and puts out the best light), and do either Panamera or Gatling Gun shrouds. As for housings:
Or if you don't care about the housing quality:
Either one you'd have to bake open to install the projector. It seems difficult but it really quite easy, especially since you'd be using a Mini D2S in a housing designed for an H4 bulb (no alignment issues). The wiring harness is plug and play, and you'll end up with headlights as good or BETTER than your Range Rover's. PM me if you need any help, I've done a couple retros and would be happy to help.
BTW, the Mini D2S is a bixenon projector, you'll love it.