on the 350z i used the Vredestein Ultrac Sessantas they were very good, and for the standard OEM tyre sizes i think they work very well and give a good balance of grip and cost.
on my current car; my S2k i run the falken 452's, i've been really impressed by them, but that is on a lighter car with a wider tyre and a lower profile; which seems to remove some of the issues others have suffered in the Zed.
other favourites are the toyo;s and the michelin pilot sports (MPS2's are very good but mucho expensive)
lots of other options out there. have a look at the tyre review thread.