I have a 09 g37 sedan I'm on tanabe sustec coilovers and front and rear spc camber kit I want to go with a decently aggressive set up and low i want 19s or 20s I'm thinking 9.0 in the front and 10.5 or 10.0 in the rear I'm really confused on what offset to go with any help would be appreciated

 

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Without sounding like a smart *** you really need to search. Go through the picture share section of the sedan and looks at the different wheels and set ups to see what fit your the best because your personal opinion about what is agressive is definitely not going to be the same as someone else's. Also as far as what kind of wheels are you looking at? A lot do not have customer offsets so your choices are more limited and there only may be one or two options for you and a sedan in that case.

9 and 10.5 are probably the most common widths.

Narrow things down and then put up more specific questions and people can help you narrow things down from there.