I will check the site out. The reason for the 5000k is that I put a kit on an accord with 5000k and the color was remarkable. Very white with no yellow. There is a slight (emphasize slight) blue. Didn't look crazy but very pure.
As far as reasoning for wanting to get new burners, my 04 TL has excellent light distribution and the pattern is better illuminated throughout. I know the projection bulb has some to do with it, but also know that the burners fade over their life.