Generate user list on frontend

Hi,
I did a lot of research on this topic but I can’t find the right answer. So maybe one of you can help me out.
We are preparing to launch a website where users can register. We will have four levels of users. I use s2Members to do the restriction management. With s2Members we introduced new fields for each user they fill out during registration.
What I am looking for is an easy way to provide a list of all users to the public avoiding the wp-admin-interface. I want this list to appear on the front end. I want to be able to customize the outcome of the list: the way the list is structured, sorted and which fields it will use from the user database.
Plugins like “Simple User List” don’t work for me since they are too static. Does anyone have an idea what I can do and how to solve this?

Thanks for your kind support!
Reiner