As @kenny_h found out for us last year, the stock tires actually do quite well in the twisties. I just went to track day with my new, stock, base Sling. I had no problems taking corners as fast as everyone out there. You do get more tire squaking on the really tight ones, but they hold.
And yes, I had Nitto 555 when I totalled mine. I would agree with many here, it doesn't matter what tires you have in wet conditions. It's a gamble. If you went through one heavy storm with your tire, it doesn't mean it will make it through the next one. That I know first hand.
I like those Conti. @Shack, I'm still trying to pick a tire.