+1 for the new BFG Rival in 275/35 and 295/35 if you can wait that long.
Should be better than the RS3 (which I've run extensively) in every way. Looking forwards to getting a set.
The Z2 is supposed to be snappy at the limit in comparison, doesn't handle heat as well and is slower.
http://www.onehotlap.com/2013/01/bfg...-thickens.html