Router or other device that provides auto switching

Hi everyone. Im looking for a router or any other device that can do auto switching and load sharing. I am on the process of linking two (2) site A and B using NTU Modem through a leased line and I need to have a back up VPN Network with 128kbps both connected to a VPN Modem.

Can anybody help me to identify what kind of device or router, the brand and model that can accomodate my project.

Thanking you guys for your support and cooperation.

Ricky Manalo
Brunei Darussalam