Hey Surferdude, I have just bought a Jackson Nex Gen and love it. If you do a search there was a thread on here about auto darken helmets. It kinda goes off topic towards the end, but in the overall read it. It is what I used to decide on which one to buy. Yes they are pricey, but worth it. And, it uses the standard Jackson Shadow shell, with the big viewing area. And, you can buy the lens seperate from the shell.
Hope This Helped,
Chris