Xenon or HID is usually a good mod and looks pimp. But unless you use a specially designed lens housing, you will throw light all over the place.
those other cars you saw with xenons may have a projector lens housing. a projector is the best solution for HIDs.
I saw some people in KHI driving with these HID kits or some cheap as* bulbs that was all over the place and literally blinding oncoming traffic. You dont want to do that.
Get a HID kit around 4K to 5K (as Storm suggested) and have it fitted by a good technician.