Tire cost and availability can vary quite a bit with size; you may want to mention what you plan to run.

I have absolutely no experience with Nitto.

The Dunlop Direzza ZII's are all on closeout right now, due to the release of the Direzza ZII Star Spec. From the research I've done, this seems to be a bit of a "rebrand and resell" marketing ploy; there really doesn't seem to be much improvement between the old ZII's and the new Star Specs.

I am currently running the original ZII's, after having Toyo Proxes T1Rs and Bridgestone Potenzas on in the past. They are a definite step up in dry performance, but my main incredulity comes from how hard these things grab in the wet! Great for a daily car.

Edit: They are a 200 treadwear, which can deter some people. I've seen time and time again that this rating is really only effective for comparing tires of the same brand. Regardless, I have two seasons on mine already, and they still look practically new. If I don't get another 2 at least, I would be shocked.