Ubercart Module for handling subscriptions? Trying to figure out the best UC module to use for this... 

Essentially, I'm trying to create a site where users may purchase subscriptions.  There are about 15 different subscriptions a user may purchase.  The first subscription (regardless of which one it is) will sell at $20.  Every additional subscription purchase after that will cost $10.  

Not sure which module to use (or if one even exists) to accomplish this.  There appears to be so many contributed modules, and the descriptions "kinda sorta" seem like what I need, but a lot of them sound very similar... 

If someone knows a good way to accomplish this, that'd be great...
Look at UC Recurring module. It should do what you need. The instruction on how to set it up is here.