Ive heard of 3 people who got the xt for 24k out the door. Base modle and you can get them for less then msrp.
And you can make a sti a sleeper. I see a 2.5 rs as a pretty sleeper vehicle and you can make a sti look just like that except for the brakes.
Paint the calipers black, get some toned down silver wheels, and a black fmic swap for a rs hood and get rid of the wing and no one will look at you.
Oh and exactly what part is borrowed from the wrx? The only one I can think of is the wrx turbo.