Difficult to say...
..without prices? Servers are available on large discount if you are buying a lot of them, but don't expect them for pennies if you are just buying one for your FusionIO powered storage.
So the bottom line is what would 15TB of RAW Fusion IO flash be in a server kitted with the CPU, RAM, and IO modules to power it?
If you are significantly below £100k in the UK you have a fight on....
Biting the hand that feeds IT
