Hello from a fellow Michigander. I'm from the Bloomfield area.
If you have great situational awareness, have the flags memorized like the back of your hand, and can keep yourself from seeing the "red mist", you're probably good to go for HPDE 3. If in doubt, the HPDE wizard is helpful:http://nasagreatlakes.com/rungroups/hpd ... HPDEWizard
I have only been to one NASA event, but more track days than I can remember with BMWCCA and PCA. I fit in great with HPDE 3.
NASA is very serious about making you a better driver. I am looking forward to October at Mid-Ohio!