Dont waste your money on any bulb that is "colored" or has a filter on it. >This<
is a great explanation why bulbs like the one suggested in this post are almost always complete trash. Rule of thumb is that if the bulb isn't clear (ie. the glass looks blue, yellow, etc), all its going to do is filter out perfectly usable light in favor of giving you a "pretty" color.
I ran GE Nighthawks and Philips VisionPlus bulbs on my old ZTS and was always very happy with them. I plan on putting a set of the Nighthawks in my high beam sockets for my HID lamps.