OP, I second RB's recommendation.
We both (and a few other posters in this thread) follow the automotive lighting retrofit scene and those guys (along with powerbulbs and theretrofitsource, also mentioned by others), are go-to suppliers for genuine bulbs at great prices.
What you are saying is like a BMW newbie saying "I called BMW to ask where to buy parts and they said the dealer, so I'm buying there. I wouldnt buy from ECS or Pelican or RMEuro because they arent authorized or nationally recognized".
Not debating with you, just trying to help you reconcile his view with yours.
If you feel more comfortable with your research, there's no problem with that.
I myself got Osram Nightbreakers from Powerbulbs and are much brighter in both perception and instrumented testing by third parties posted online, and couldnt be happier with them. I would have gotten from hidbulbz but I was specifically looking for the higher output Osrams.