Do you mean bi-xenon (dips and heads) or dips and fog's? Didn't think you could Xenon the heads without upgrading the LCM (Light control module) + separate ballasts etc... if it can be done at all (legally that is). Technically anything is possible. Was it even a factory option?
There are lot's of LED replacement units on eBay for the halo's, I'm not that versed on temperature rating (whiteness / K rating) but there seems to be plenty at upward of 3W (Which are all but invisible during the day).
Yeah with your adjusters in and the beams set up properly, they should be pretty decent - still will be tested with 400bhp though lol.