Having just sold my 2004 E53 4.4 Sports Pack I have ordered a new SD as follows;

Alpine White
Black Nevada with Aluminium trim
Sports pack
20 inch wheels
Comfort Seats
Panorama Roof
Running boards
Hi Fi Upgrade
USB
Anti Dazzle/Folding Mirrors

My previous two BMW's had xenon headlights (4.4 X5 and 330ci) as standard however they are not standard on the SD but rather an option for $2,100 - what a rip off! Has anyone replaced the low beam lights with aftermarket HID/Xenon bulbs - is it any easy job?