I recently got litronics and didn't like the yellow halogen lights for the high beam and fog lights. Your stock light housing actually has three H7 halogen bulbs in it - low beam, high beam, and fog light. Replacing all of them with something whitter/bluer can be costly...
I bought some Sylvania Silverstars and fortunately only opened one package to try them out. I returned another un-opened package. I was grossly disappointed. The light is whitter, but only barely so compared to standard Sylvania/Osram bulbs I had. I've got the Silverstars in my fog lights now, which are a little yellow any way (yellow plastic inside housing).
"Gary in BR" sent me some blue H7 halogen bulbs that I put in as my high beams. They are much more white/blue than the Silverstars and have that "cooler" look I think you want. Unfortunately I can't tell you what brand they are as they're not marked.
They look MUCH nicer with my litronics though.
Based on my limited experience I would go for some of the blue coated bulbs, but just make sure they're rated for 55W or no more than 65W. The ones Gary sent me are rated for 55W.