Which mobile company delivers Android system updates the fastest? Basically, I am an Android developer. I am looking for a new Android mobile phone. 

Could you recommend the mobile company which first publishes an update of Android system? I am tipping at HTC, but you may have a better suggestion?
Buy a Nexus S device directly from Google. They will be the fastest at updating to the latest firmware. And they will always ship with Stock Android. Everyone else is Way behind. most are behind because they add customizations to android and have to make their changes, then they have to go through the google approval process. Not to mention then having to go through the carriers testing process for deployment.