Thank you!
That is a Pro-Line from Constrictors NW.
I have been looking at coastals at Nick's page as well.
This video talks a little about the Jag issues. He bought all his carpets from Ed Lilley (Constrictors NW) and seems to know a bit about the level of neurological issues in certain snakes.
https://www.youtube.com/watch?v=lDJJ7reQaPw
I think if you plan to purchase from Nick or any other reputable breeder you should wind up OK if you do go Jag.
I'm more of a locality, or "Mother Nature" colors type guy so I'm not experienced with Jag carpets.
This guy uses several cage brands. He seems to like Pro-Line, AP and Boaphile.
https://www.youtube.com/watch?v=85V3JrjNO58
Personally I'd pick Pro-Line or AP based on the increased ceiling, heavier and better quality material.
The Boaphiles do look nice though.
Keep us posted on the potential new snake!