(Centerline, Erco)
You'll have to make up your mind. Centerlines are hefty wheels, ERCOs are extremely light.
I've got 8" wheels on the back of my car, but with a wider tyre than you suggest. With your tyre, I'm sure a 9" wheel will fit, but you have to hit the offset right on. I don't recommend more than a 7 with your tyre.