I know Simpson is actually discontinuing their SA2005 lineup in favor of SA2010 helmets over the next few weeks, but I am unsure of what changes have been made, if any. I remember hearing that there weren't any new developments in safety technology, but I could be wrong. A SA2005 helmet will still be good for many years to come.
Helmets are definitely a personal preference item. A local autocross is a perfect place to get a feel for a variety of choices, especially if there are no tracks in close reach of you. You will definitely need a SA-rated helmet to drive with most track day organizations.
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