With Windows 2012 the clustering changed. the basic config san connected to the cluster is no longer the best option. using the Scale out file server you get better performance and better redundancy. but more important the cost are less. below are some screen shots from the TEE13 sessions more about this is coming this week.
The session links are also there. Check it out. Windows 2012 R2 is changing your IT designs.
My Birthday gift would be http://www.violin-memory.com/products/velocity-pcie-cards/
This is the way to bypass your san and get an optimized Windows 2012 environment to boost your performance