The above offsets for a coupe would definately fit but is pretty conservative.
Have a look here for some ideas: http://rimtuck.com/search/thumbnails&make=Infiniti&model=G35+coupe&sort=1
Bear in mind most of these are slammed and lowered quite a fair bit. Question is how much are you lowered if any at all?
rule of thumb, the lower you go, the more you can squeeze into your guards as it will give you more camber like so ------> /oo\
To get the desired look you are after, you have to lower your car even if its a mild drop otherwise you will be sporting the 4WD stance...