I'm not bragging but I think 12.9 with a Full Weight stock LS-1 is pretty darn good.
about 25K, I bought it with 19K for 15. It was unmolested (un-modded) and had new tires + plus a crappy Chokemaster stuffler. The first owner baby'd it so after owning it for 1.5 years I am still glad I bought it, even if I paid an extra k or two.