Philips 85122+ 4300k is what I have changed to. Great bulbs, better output than the stock lamps as well. Osram xenrac cool blue have great reviews as well. They have the output of a 4300k bulbs but have a cooler color temp of about 5200k with no loss in lumens. They actually claim them to be 20% brighter than the competition
Link for comparison
http://www.hidplanet.com/forums/show...Intense/page28