Tire size on 18/8.5

I am wanting new tires and I am running 215/35/18 now on an 18/8.5 there way to small for daily driving. I am wanting bigger. I am thanking about 245/35/18 I want low pro but with good width I want a flat side wall not a thugged out stretched to fit like the ones I have now. Any ideas or pictures I can look at. Thank B.H