wider larger wheels/tires

I just purchased my first CL9 and every first 2 mods that we purchase as we all know are Coilovers and wheels. I've been debating whether purchasing 18x10.5 or maybe just toning it down a little bit. If anyone here has ran a set up similar to this one.. Please inform me more about running wider...

I'm kind of dumb. My 2014 TSX wagon has 17" wheels but I want to go to 18" or 19" to fill wheel well and also want a wider tire but please advise specs for bigger wheels and tires that will not rub and without any other kind of change.