Bone stock. I know how you feel. The CRaZy in stock setup is, umm, competent, but so pedestrian. I typically don't modify my cars; I'm that guy who races nothing but stock, except for a set of Hankook K12's so my daily drivers don't get punished.
I've been autoXing for 3 years, but last time I did was 2008. I'd have to say, there is some level of satisfaction driving a slow car pretty fast. The Miata doesn't count because that baby can dance.