[LfiveohX]

I think everyone here is trying to help you by giving you their own opinion (which is probably biased). I will say this, no matter what kit you buy, you will definitely enjoy the power increase. Vortech, Paxton, Procharger, Kenne Bell, etc. are all real good kits. I don't think you will hear many complaints of quality from anyone who owns any of these. What you do need to worry about, if anything, is are you going to want to upgrade after someone with another blown stang or vette blows you off? Probably. I personally think the roots style superchargers are real cool (almost instant full boost), but can the tires hold up from a stop? (I don't know). I would suggest a centrifugal (Vortech, Paxton or Procharger).
For your other issue with resale value, your car is only going to be worth what someone else is willing to pay for it. If you add any supercharger kit, you will have a more difficult time selling it because now you are limiting yourself to those who want that specific model. If I saw two Saleen's for sale, 1 stock and the other modified, I would pick the stock one anyday. Just my opinions on all of this.