I run 17x9's with 255/40/17's on all tires.
The wheels are just a basic silver Cobra R.
The tires do stick out just a tad from the rim, which I don't mind as it protects the rim.
One thing to be cautious of, sometimes on the fronts if you run a 275+ the tire might rub on the splash guard.
It would be a smart idea, for a street car, to just run the same size on all 4 tires.