Configure 2 ASA's over a WAN link

Oscedumir

Hello all,


So I just got this job a couple of weeks ago and they have dinosaur age Cisco equipment they want me to work with right now before I let them know of my recommendations for upgrading. We have a microwave WAN link from Cox in San Diego, CA. that provides the internet for our remote building across the border into Tijuana,MX. We have an ASA 5510 on each side and everything is working as is albeit on a flat network. However we want to add a second WAN link using two seperate technologies. We would have a second microwave link in San Diego but on the Tijuana side we want to add a 200 Mbps Fiber link. What is the best way to go about configuring the ASA's for it to work? Is a site to site VPN the way go to or is there a more practial and efficient way? Please let me know if you need any additional information regarding the current network setup.

Any help would be greatly appreciated!