Ive got 19 x 8 +45 BBoss rims with 235 / 35 / 19 Kumho KU19 tyres, I am runnning Eibach springs, Cobb sway bars and stock struts, legally this is OK as you are only going 1" bigger in both dimensions.
I am about to get a set of 18's again after cracking the inner lip of one rim, I could repair it for about $150, but honestly Im over the 19s thing, more trouble than they are worth, they look nice, but thats about the limit of them. I am also about to fit a set of coilovers so ride will be even firmer with this setup, If you want a cheap set of 19's with tyres to try out the idea let me know.
Nearly all men can stand adversity. But if you want to test a man's character - give him power.
Abraham Lincoln