The official “Google Phone,” the kinda dead Nexus One, is still Google’s official “dev phone.” The phone, available unlocked for $529, is running the latest Android version and includes the “Google Experience” suite for Android development.
The Nexus One combines an up-to-the-minute platform (Android 2.2), modern hardware, and the pure Google Experience software suite. It’s a good choice both for people who want to build Android applications using either the SDK or the NDK, and those who want to experiment with modified versions of the Android platform. Note that the Nexus One still ships with Android 2.1 but will download 2.2 soon after you turn it on; make sure you’re near a fast network.
Pop over here to read more but if you’re in the market for an Android phone, you could do worse.