I have used the aluminum pylon and the tow hook, and since there really isn't much wake behind the 97 challenger, it doesn't make much difference. I still have the stock aluminum pylon, straight, if someone wants it. Ski shaft in link listed above says $0.00, so it is either free, or no longer available...
I have the pylon with the nylon knob at the top, and can sell it if needed. It worked for my 200lb butt on a wake board, two skis, attempted slalom ski, and on a surfboard, but I used the stainless one I made after hearing that they tend to bend if over used.
It extends to about 4 or 5 feet above the water, which is MUCH better than the near-water-level tow hook when it comes to pulling one up, but once up, not much difference in the ability to ski behind the boat. Less chance for the rope to catch in the wake, which can be annoying.
If anyone needs it, PM me, because i have sold the boat and no longer need it. It is just sitting in my garage wasting space.
And Phildoo is right, the tow hook is more for towing disabled boats and such. Where you don't mind the rope getting caught up in the wake. For pull sports such as wakeboarding, skiing, or even tubing, the higher you can get the rope, the better.