Personally the only Xenon lights that I would pay fifteen cents for would be those in the new S class. They have a means of using Xenon for both high AND low beam. I paid $1,000 for Xenon's when I ordered my '96 E Class. It still had halogen high beams as do all but the new S Class.
Unless you can find a way to have Xenon high beams my experience and recommendation is to save your money.
Have a great day,