I'm in the market for a new winter helmet that doesn't fog up very easily and from all my research, I'm leaning heavily towards either a Scorpion EXO-400 or EXO-700. I can't decide which of those to go with though. It seems that the primary difference between the two is the shell construction. I know from my searches that a few people on the board use these helmets. My question is whether any of you have experience with both or have enough knowledge about them to make a wise choice between the two. I'm just trying to decide if there's anything about the 700 that makes it worth the extra money. Thanks a lot.