Chris, I am not a fan of slicks on a stock car either...and for that matter a stock suspension car really isn't set up to fully utilize A6s.
For a car on stock suspension, Nittos, Victorocks are about as good as you will get.
And Walter is right, the newer "street" tires are pretty remarkable.
The new Dunlop Direzzas, Bstone RE11, Hankook RS3, Kumho Ecsta XS, and a couple of others are pretty amazing for non-DOT Rs and wear ratings over 100.
I am running a set of fairly hard (340WR) BFG Sports right now on my C2 and they did very well at my last outing at Laguna...
Running low 1:50s on Street tires, with H&R sport springs, stock sways and stock struts.
Very mild alignment.
Next season for AX and any track duty I am considering running a set of the Nitto NT01s, but may just put on a set of Kumhos Ecsta XSs or Dunnys.
These street tires now are better than the DOT Rs of 10 years ago.