Buy name brand like PIAA or OptiBlue from Autodynamic.com skip the junk on ebay. Both are excellent. Both are blue/white. Only the PIAA low beam is available in 55W. OptiBlue at 100W will require the auxilliary wiring harness.
I decided that the blue/white looked great in the low beam. I left the standard bulbs in the high beam. The blue/white seems to pick up white reflectors or signs better and the standard provide better overall visibility.