Wheel size is relative to your liking and the style you want for your car. I personally have 20's since that the style I liked when I got them, they aren't cutting it anymore. So I would say between 17" and 18". Why, I don't know those sizes give you a nice balance between tire and wheel, obviously with my 20's I have a thin tire and feel every little rock or pothole.So with 17" 18" you get more tire, also a little less risk to crack the wheels.
As I see offset its how far in or far out your wheel/tire will sit on the wheel well. You need the right combination between width/offset/tire/ride height to pull it off, if the combination is wrong you will rub on the suspension or with fender/quarter panel.
Look here VV
http://www.gtsparkplugs.com/WheelOffsetCalc.html
And I don't know much of the offsets/width/tire combinations for the 8g but thats going to be a tight fit since those p45 are 9" wide, but it may be possible with the right tire and offset, fender rolling/cutting is a must, may need fender flairs, and on the suspension side may need coilovers to have more room. Thats my opinion, wait for the wheel/tire experts on this site to give you the exact measure and offsets.
Check out member: greddy
https://www.thegalantcenter.org/show...=31660&page=10
he has some crazy wheel width/offset/tire combo 17x9 +27 255/40 tire but he did some major cutting, have's fender flares and coilovers.
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