You may have better luck listing this under the classifieds in this forum. Also, I wouldn't bother listing out all the basics like traction control, power seats, etc on this forum as many of the members are well-versed in what comes standard. Instead, just list which options the vehicle came with.
For example, I can tell from the pictures alone it does not have the sport or cold weather packages but that you did upgrade to xenon headlights.
$13k seems like a fair starting point.
2004 BMW 530i (his) -Titanium Silver -Grey Dakota -Dark Poplar -Premium -Sport -Cold Weather -Xenons -Heated Rear Seats -Active Steering -Logic 7 -Sirius
2010 Lexus RX350 AWD (hers) -Smokey Granite Mica -Black -Premium -Comfort -Nav -Tow Prep -Premium Sound -Wood Steering Wheel/Shifter