Edgerouters & wireless building to building link

Hi,

I'm looking for some advice on how I can link 2 currently independent subnets with separate internet connections together via a wireless link. I can VPN between them obviously but I will have more bandwidth,lower latency and no usage limit problems with a wireless link. The following diagram shows the topology I'm aiming for:



I'm also hoping ultimately to be able to do some failover between the routers should one of the internet connections go offline. I'm thinking OSPF may be the way to go on that? 

I'd be grateful if anyone could provide some useful guidance or point me in the direction of some existing documentation on the best way to achieve this.

Thank you.

James