I recently picked up the Potenza S-04's and find them to perform just fine. They're highly rated and you can get them for about $830 for the four. I bought mine for my 2014 Z (replacing OEM) from Tire Rack for $800 about a month ago (b0ught mainly because they have better wet performance than stock as well as better wear rating).
http://www.tirerack.com/tires/TireSe...=57751&tab=All
