Welcome!
Elhigh hit pretty much everything, no need to repeat it! The addition I have is to think about a boat tail. A LOT of drag is back there, and one can make one pretty cheaply. Other than the attachment point (I was lazy and bought a bike rack), it was relatively cheap for the immediate and drastic improvement.
I would also advise an underbody over an air dam ONLY because of how much space you have. Air is going to be traveling under there unless you bring it down very far, which will be hard to keep stable. Also, it should be very easy to do the underbody relative to most other vehicles. (The Mustang I can get on ramps, with it about a half inch above my chest/on my chest- the Insight can't get up my ramps lol)
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