The A/S 3s are certainly a great tire but if you have dedicated winter tires you could likely get away with Pilot Super Sports instead, and they are worth it. It really just depends if you think you're going to ever get caught out in the occasional snow/ice or if you can plan around that and run a true summer tire.
Super Sports on any amount of ice or snow are a no go.
And just to correct what n8dog was saying: PSS have better traction that Conti DW in almost every situation, not to mention much stiffer sidewall. See the link below for a comparison.
http://www.tirerack.com/tires/tests/...y.jsp?ttid=148