After I've swapped to HID Projectors I've been wanting to change the bulb out of the headlights to a different temperature rating, but I can't seem to find many companies that offer D1S bulbs in temperatures other than stock or 6000k. Anyone know a good site?

 

Are you sure that the headlight bulbs are D1S? I have an 2005 as well with projectors and they were D2S. I've changed them to D2C 6000K that has a slight tint of blue to it and I'm quite pleased with the brightness they put out. The headlights will take the D2C cuz these bulbs are meant to be used as D2S and D2R bulbs. The difference between the D2S and D2R is the grooves on plastic adaptor part of the bulb. Just keep in mind that the higher color temperatureyou the lower lumens you'll get which dimmer. I got mine from ebay 3 years back and had no problems with them so far.