Nice spec! Should be really good to multibox with this rig.

I agree with Owltoid that you can get a decent 5 box rig for less. But I guess if you will be using it for more then just WoW or for future games it's nice

Instead of the OCZ ssd you picked I would recommend the intel second generation M25. It is faster specially on small random reads which supposed to be just what you need for wow (and/or your os). It is also a little bigger (only of use when you put both the os and wow on the ssd).

I think you will be best off running the os from the F1 and wow from the SSD, as I have read from some users with some other users they are running wow fine from an SSD with just one install. But I guess it depends on your preference.