If it was possible I'd be sitting on my 18x9.5 (275) and 18x8.5 (245) setup from my 300ZX but I was told repeatedly that it does not fit on the sedans.

I think I'm going to skip on the wheels. I'm still 50/50 on running black wheels with a silver car (at least without a polished lip) and I don't want to make an impulse buying decision just because I need tires and the option is available. I'm getting the wheels with tires (90% tread) for $650 but by the time wheel spacers come into play I'm looking at $900+ which puts me into OEM 19" Rays territory.