All sti's have xenons... He just wants a different color. I believe 30k was along the lines of pink?? Correct me if im wrong.
I changed bulbs a few times... I had slight pink ones... Slightly bluer ones. Still have the oem sitting around and the oem are best visually speaking by far. But ive kept the dark blue ones (10k?) for the past few years cause i absolutely love the way they look.
Also listen to holycrap, buy quality, not crap that is cheap. The cheap crap burns up rather fast and wont last longer than a year. Not to mention they wont be as bright!