I agree with Andrew, let talk about the “more important” things, for example, why you feel a cage is necessary and also your generalized statement about coilovers and suspension settings.
In my opinion, your level of customization only requires a good butt tune. Set your springs/shocks to the level you feel comfortable. (Which you already have with your AGX’s) Same can apply for coilovers… just stating that you want “Stance” coilover’s isn’t enough. You didn’t mention what model, let alone the time-frame in which you’ll purchse said coilovers. GR Basic, GR +, GR +PRO, GR +THREE?
Planning for the future is fun, don’t get me wrong. But what you want to do is just a matter of getting it done. No need to ask silly questions where a bit of butt googling (don’t look at my butt though) couldn’t answer for you.
Oh and to qualify my post: