I never suggest RAID for your OS drive. Look at this guys thread.http://www.tomshardware.com/forum/296609-33-uninstall-drivers-nuked#t2205453
And thats simply the one I've been working on today. For your OS you really want just a single disk. No RAID drivers to worry about. You talked about a drive dying, most of the time I see people complaining that the drivers got F'd up somehow. (deletion, lightening strike, etc.) If you must do this leave your OS on your green drive. Put all important data on there to. Setup the AID0 array and move the swap file and anything needing speed onto it.