You should try and do some more troubleshooting before you go ahead and replace / buy / do anything else.
Try swapping the bulbs from each ballast, swap the ballast on either side..
See if you can identify if it's a bad bulb, bad ballast, or if it's a problem in your cars electrical system (which I highly doubt given the nature of these HID's)
(btw, you know our N/A crossfires have absolutely nothing to do with AMG right? you might have the worlds largest AMG sticker on your car that isnt even an AMG..
)