As I type this right now at 3:22 mountain standard time the Exclusive versions of both Hawk and Viper with the extra heads are suddenly in-stock. So if you wanted one, best head over. They can be had for as low as $45 a month.

Cobra Viper Sixth Scale Figure - Sideshow Collectibles

General Hawk Sixth Scale Figure - Sideshow Collectibles

I'm still in the air about Hawk. But the Viper is totally awesome.