i'd use the SSD for the OS, and essential programs
I'd use the other hard drives just for storage of stuff.
I don't see a need for the velociraptor drivers, or RAID systems
Even if you got a slower 5900 RPM drive for your media, you'd prob. never notice much a difference.
The Libraries of Win7 are very easy to send to a different drive (i have mine going to a Windows Home Server which sits upstairs from my PC)