SAN Storage & Server for Oracle Replication
If you have already got an EMC then SRDF is the obvious choice, tho' Veritas Volume Replicator may be an option. SAN is not something you usually buy "off the shelf" the first time, the vendor will work with you to establish your requirements, both for performance and resilience. Other vendors you may which to consider are HDS, 3Par and NetApp. 

However my recommendation is to not use the storage for this, use Data Guard because a) it's free once you already have paid for an oracle license and b) it enables Active Standby, something that I am very excited about myself.