I'm running 245/35's and have been for almost two years now. Very slight stretch on 18X9.5. Next round I'll probably do 255/35, but I was also considering 255/40 for a little more sidewall? 255 won't strech, but I think a 40 sidewall should clear okay. I'm about 1.4" dropped on KW V3's.
http://www.tirerack.com/tires/tires....S&autoModClar=
or
http://www.tirerack.com/tires/tires....S&autoModClar=
Currently running DW's and they have great traction and don't seem to wear quickly. I know the PSS are top of the line though.