I don't really recommend fitting a 245 tire on a 9.5J wheel. It will be stretched out. A 9.5J with ET 23 wheel in the rear will stick way way out no matter what size tire you fit it with!
For a nice and a staggerd fit, I would recommend 19 x 8,5J ET:34 to 36, Rear 19 x 9,5J ET: 40 to 47 fitted with 225/40-19 or 235/35-19 front and 255/35-19 or 265/30-19 rear.
Anyone can drive a fast car, but few can drive a car fast!