You say the plenum hasn't lost much paint so thats always a good sign.
My honest opinion - the comp ratio would worry me. I realise you are able to trade in your current cars and the appeal of Brembo brakes is always tempting (however this can always be done later, some people say they are over rated, never experienced brembos - another thread.lol)
I would be surprised though if a perfectly standard car returned that comp ratio, gut feeling thinks it may not have been so standard with its previous owner.
Personal choice I would skip it.
End of the day anything is fixable if you really like the rest of the car which sounds pretty good.