well well who do we have here...Huggy Bpresive
Nice write up and I like where this is going. I would go the G Force Rotas but thats just personal taste. You will be pleased with S Drives but probably not the price.
I would be getting it tuned asap if you are running the AEM CAI. The stock tune is rich and rubbish so you aren't doing the engine any favours by waiting imo especially with the CAI. Spend the money on a bigger WL rear sway bar and links and def an WL ALK if you are going lower on coils. Better brake pads also wouldn't be a pad idea.
Unless you are heading down the path of a bigger snail I wouldn't bother spending money on bigger injectors or fuel pump but again my opinion.

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Funny looking German Subaru