Avon ZZ3 seems to be a popular choice on the ZS.
I've got Toyo T1R's on the front of mine at and theyre good. When I come to replace them I might try the Avons though, see what all the fuss is about
Also Im bored with the tyre tread on the T1Rs since Ive had them on my last car and now the Zed - weird thing to get bored of eh