Noob suspension/tire questions

ImportConvert

What is the widest tire that can be fit under the front and rear of the 370Z, assuming correct rims are chosen?

Who makes a comprehensive suspension package for the 370Z that will get me over the 1g mark and not beat me up or bottom out on every speed-bump. I am thinking coilovers/shocks/struts/sway-bars, etc. all in 1 package from 1 company so that everything compliments and the "rates" of the bars/springs/etc. all play nicely togather? I don't want the thing to ride like a log-car. I just want awesome grip (1G+, preferably 1.03+), a good ride on the streets around here (kinda crappy, but no gravel or off-roading planned, lol. Lets just say that the construction company that made some of the highways in my town were in bed with the local government and the highway is a bit sub-standard in some areas. Not nice glass-smooth like a Cali highway or something), and an attractive stance.