Sure, gotcha, I apologize, i'm a bit new here, this is an awesome site!
For the proposed solution I would recommend 3 tiers of redundancy in a multi-threaded setup.
Continue to use SQL in a cluster configuration, 2 nodes with a DRBD RAID10 pair of storage systems to keep the data up and running. In the event of Datacenter failure (worst possible case) have a 3rd tier passive replica at another datacenter with transaction logs being shipped.
2 Web servers, local data stored on a seperate set of drives RAID1 or RAID10 depending on size and I/O. Replicate data via Robocopy.
Added performance and requirement for 100%, incorporate dedicated load balancers in a pair.
Additional replica web server at a seperate datacenter.