Hello,
I went through wizards docs and I find jquery steps to be a good alternative. It has nice look out of the box and documentations seems to be a little better than the one from techlaboratory. jqwidgets window seems to be ok too.
From me you will get a nicely written modular code. You will have only one global variable, which won't pollute your site's global scope. I write all my code in modules.
I have a fulltime job as a team leader of 8 people, but I do 25+ hours a week freelance work. I have experience working from front end to backend with various technologies. You can count on me that I understand how things should work and communicate together.
I would be very happy to add this feature for you, you won't be disappointed! :)
If you have any questions, please ask! I will be more than happy to answer.
Best wishes,
Nikita