Ok, I did some research on the PIAA "platinum super whites" versus the Sylvania-Osram "silver-stars". It looks as if the silver-stars might be the better (whiter) bulbs, but I do not know the cost of either brand's 9004 bulbs. Here's the data:

PIAA
Platinum Super White - 9004
45/65 watts
3800K

Sylvania-Osram
Silver Star - 9004
50/70 watts
4000K

The higher the "K" temp, the closer to resembling day light you are. Standard halogen lighting is 3200K and day light is 5400K. I hope this helps. It definitely did for me. -- Mikey