I am considering the following setup for my Z Roadster:

Front: 18 x 9.5 +28 offset, with 245/40/18
Rear: 18 x 10.5 +30 offset, with 275/40/18

I do not plan on lowering the car in the near future. I do want to be sure that these offsets will not require any spacers, and will not interfere with brakes or rub fenders. I also want this setup to look good (do not want the rims/tires to be pushed in too far or stick out beyond the fenders.

-Will the above setup work well and look good on my Z Roadster?
-What is the approximate lip size that I will get (front and rear) with the above setup?
-Does anybody have pictures of a similar setup on their Z?

Thanks.