I wanted to report that I just finished the aux input mod, and it works great. There is another way to do as described on the "other GTO forum" and while it is probably a slicker mod, this way works great and sounds great for little cost. Even after buy a low wattage solder iron, solder and a cord, it was only 22.00 at Radio Shack. I am using the compartment right under that radio to hold the iPod, and drilled a hole in the back of it to run the cord thru.
If anyone is considering this mod, I give it a 9 for ease to do it, and a 10 for sound!