They are probably worth the most to you, even though you don't realize it. If it is a ture Saleen, you'll want to keep them. In the event that you decide to sell the car, it will be worth much more to a collector if you have them. One of the biggest mistakes Saleen owners make is selling parts off of their cars when they decide to go aftermarket. Don't get me wrong, if you don't like the wheels, change them (it is your car). However I'd keep them if I where you. I keep everything off of mine just in case I decide to sell it later. You might want to consider doing the same.
One more thing. Before you start changing things, you might want to get a good understanding of what you actually have. In the early years, Saleen made a lot of "custom" cars at customers request. You should call Liz at Team Saleen, give her your VIN, and see if there is anything that makes your car more rare. You didn't buy a regular Mustang, you bought a limited production car. Just thought you might want to see if there is anything "special" about it before you start changing it and selling off parts...
Sal