As far as headers...I fully trust the ARH and SLP systems. I have sold both, and they are a quality product.
You could also do a CAI such as the Roto-Fab, and then tune the car. You wouwld realize around 50HP and it would still drive like stock, and run as long.
The other option I would consider would be a supercharger package such as procharger or vortech. They are easier on an engine than the roots style like the Magnacharger. Yes they will decrease longevity of your engine.....but we are talking about getting 75k miles instead of 100k...not like it will blow out next weekend or anything like that. You would also end up gaining well over 120Hp or so.
That si my opinion...I am sure you will get responses from plenty of others also. Feel free to get in touch with me if you have any questions, or need to check prices on anything. I am always happy to help.