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Since you're on CS, you'll have to ask yourself what is more important, stance or wheel gap. IMO, go with 20's if you don't want wheel gap, 19's if you can live with a gap and care more about about stance.
LOL, 19's yeah right,... get the 20's you wont regret it. Hopefully your budget allows it. Seriously the 19's end up looking small once you see a set of 20's on another gs.