I have the H8 (35Watt) "Super White" from MTEC (4350K). It still is a compromise but they are a lot whiter than the standard ones and they stay very visible even in bright sunlight. If you want them to be more blue/white (5000K and more) you loose in light output and you could go for the H11 (55Watt) instead, they will fit after a small modification.
Grtzzzz