If reliability is critical I'd move to the cloud immediately.
One of my customers is in a similar position as you; the availability of their data is highly critical. The law in our country...
John Savill's Hyper-V Master Class
Join John Savill for 12 hours of comprehensive Hyper-V training. This master-level online training course will explore all the key aspects of a Hyper-V based virtualization environment covering both current capabilities in Windows Server 2012 R2 and looking at the future with Windows Server vNext.