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Clustering & 3rd Party recommendations

I’d like to know if anyone has opinions on the various HA tools out there for SQL. The ones I am aware of are EMC Legato, XOSoft WanSync, neverfail, and MSCS. We’d like to have a "cluster" of SQL servers, fully replicated, and available for failover. I was also wondering if there’s any of the above that do this, and each of the SQL Servers in the "cluster" is available via its own IP for queries. Am I asking for too much? Mark Havens