I think that it's worth noting that the benefit vs. the cost of the really high end bulbs is fairly limited. Is it really worth spending over $200 for a pair of Osram Nightbreakers vs. say the Morimoto XB35s for about $60? I don't really think so.

(I'd argue that the money is better spent on a projector upgrade, as an example.)

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2011 M3
2006 Sierra 2500HD 4WD LBZ/Allison
2004 X5 3.0i 6MT
1995 M3 S50B32
1990 325is
1989 M3 S54B32

Hers:
1989 325iX
1996 911 Turbo