One other thing about SA-rated vs M-rated helmets.
M-rated helmets have a one-impact-based rating (after hitting hard once, they are no longer certified). SA helmets have a multi-impact-based rating.
In most cases, it's not a big deal, but if you plan on driving cars with roll cages, you want to have an SA helmet, because you are bound to bang it on the cage more than a few times. Another point to keep in mind is that M-rated helmets are generally a bit heavier and larger in outside diameter.
They still sell Snell 2000 helmets, which are cheaper, but I recommend a Snell 2005. Not only will it provide better protection, but it will also last longer.
As for open face vs full face, I personally prefer having a closed helmet because I feel safer in them, plus I also use it to go drive rotax karts from time to time. However, when I am coaching/instructing, I sometimes with I had an open-face. It makes it easier to talk to/communicate with the driver.
I don't know if they still sell them, but I bought a Snell SA2005 helmet for a reasonable price two years ago. It's an HJC AR-10 (if you squint, you can see it in my avatar picture
![:D](images/emoji/happy/big_grin.gif)
).
One last important point: do a test fit before buying. People tend to buy helmets that are too large. When you try them on, have a friend (or the sales person) shake your helmet from side to side while it is on your head. If it moves, it is too small. Don't buy it too small either, though. You'll get a very bad headache pretty quickly if you do.