For our systems VMs we are running CS240G, which is perfect. We had the same for VDI but we were using too much CPU and cash. We did a live upgrade to CS440G with 2Tb SSD drives. It was an easu upgrade and the users did not notice at all. I took the CS240 to 28000 IOPs with no problem. In a normal day our system Array hit around 5K IOPs and some time 20K. The VDI is running around 5-6K and I see spikes to 32K IOPS.
Here is my info if you need more. Cisco and Nimble have a design for VDI with UCS blades.
Valtcho.Bakalov@colorado.edu 3034923419