All of those options should be relatively easy to retro-fit, xenons are the most involved, if the car has winter pack that would be a bonus as will give you washer jets ready for xenon retro fit.
Cruise is easy as is RCD510.
Highline can be a bit more involved but a 55 reg will be easier than post 2006, as it should have a 962 cluster if its midline.
You might be very suprised though as some people have no idea what options cars have, mine wasnt advertised with xenons but the picture told a different story
good luck and if in doubt take lots of pictures then we can disect it after-wards