Option 1 without a doubt.
I ran nationals this year in TTC in my S2000. It is on the aforementioned dyno reclass. Not much out there can touch it, except a very well prepped and driven e36 M3 and even then, its only due to the power the M3 has over the s2000.
Edit** - Oh, and Emilio from 949 Racing in their "Crusher" miata. That thing is wicked fast.