I'm trying to figure out what type of tires I should be looking at for my Miata and I'm having a hard time understanding what rules will be applied. 

It starts with Hoosier's announcement "HOOSIER NAMED TIRE FOR NATIONAL SPEC MIATA COMPETITION BEGINNING IN 2012"

http://www.hoosiertire.com/SM2012.htm

Which at first I took to mean that I could consider Hoosiers, but there seems there could be lag between ICSCC rules based on (Oregon Region SCCA).  Per this discussion on the icscc forum:

http://www.icscc.com/forums/showthread.php?1874-SCCA-announces-2012-spec-miata-n...

So my question is should I buy Hoosiers for a Spec Miata that will likely do most of its driving at Mission this year?

Rod.