Ubercart

Have you looked at UC Node checkout?http://drupal.org/project/uc_node_checkout

I think I might also recommend UC Node Checkout as well. What you're looking to do would create something of an administrative nightmare I think. What I use the node checkout module for is to create a new node type that will represent a registration, just like if someone filled out a paper registration form. Once a user creates a node of that type, an associated product will be added to the cart that they can purchase. You can then hook into the checkout completion process to update that node to say it was paid or something. This is what I did for Lullabot's Do It With Drupal website.

The advantage here is you can then create a simple View that will list out all your paid attendees and let you do some simple administration through that form instead of having to search back through orders and product kits. Product kits at this point are just too limited to be of much use to you I think.

To verify the user(node) is paid, did you just add something like order-status as a field and then custom code in the workflow?

Basically, like described here?

http://drupaleasy.com/blogs/ultimike/2009/03/event-registration-ubercart

I'm wondering if you ever found a good solution to this (basically event registration where the costs of certain options depend on what is selected for other options). I am working on a very similar problem and the approach has been to extend CiviCRM's event functionality, but I thought I would seek out another perspective. Thanks!