Yeah I have to disagree with those saying the SA 2000 are good. Our local SCCA groups I attend don't allow them anymore and SNELL also does not advise using them either. You should get a SA2005 or SA2010 helmet.
"
Our advice to Safety Inspectors and Racing Authorities is that they continue to accept helmets in good condition and certified either to the current or immediately previous Snell standard. At this time, SA2010 is the current Snell standard and SA2005 is the immediately previous."
http://www.smf.org/standards/sa/2015...leaseNotes.pdf