Griever,
Glad to hear it helped!
If you do want to use VPN Monitor, we find people frequently follow this KB when the remote side is a Cisco:
KB9503 - Configuring the Source Interface and Destination IP options of VPN Monitor
For the Destination IP, specify a internal host at the Cisco's site that will respond to ICMP echo requests (pings).
First experiment with PING from the firewall, i.e. just enter ping, and then follow the prompts, specifying the target (i.e. the internal remote host), and specifying one of your interfaces that the remote host knows how to get back to. Once you have a successful ping working, use those fields in KB9503.
Regards,
Josine