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If I understand what you are talking about. You are saying you are kicking yourself for not ordering the Aero Kit. The Aero kit is a dealer installed accessory and you need to talk to your MA about getting it installed when you car arrives.
I think its a good mod to do but not the cheapest. if you are looking for style i think its well worth it. as far as the rear bumper, its the one thing i didnt get. i didnt get it cause its not that much different than the stock mcs bumper. it does go down a little more in the back than stock. if you are not going to paint the black trim i would say get it.