How to run multiple Heartbeat/Corosync/Pacemaker clusters in the same network? (Quorum)

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http://serverfault.com – We intend to run several components to run a web site. Like a load balancer, a cache and a couple of web serserves. To avoid single-points-of-failure we intended to use Heartbeat/Corosync/Pacemaker and instead of one load balancer just run two of them. Now we have different choices how we set them up and I would like to hear your opinion which one works better: Run pairs of servers in different clusters. E.g. "loadbalancer1" and "loadbalancer2". That way we wouldn't have two few servers to reach quorum if one of the servers failed. We could switch off the quorum feature though but would risk (HowTos)