Hello,
Depending your implementation GLBP, VRRP or HSRP can work, VRRP is the best option if you pretend to use a non Cisco hardware for redundacy. I use it in my network between a 1760 and a c857 and I can say it is so robust, it supports authentication and tracking using SLA. If you need to load balance the traffic between multiple gateways GLBP is the best fit for you. Redundacy = VRRP and HSRP. Outgoing gateway loadbalance= GLBP. About the configuration synchronization It's better to wait for someone else, because I haven't done this yet.
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