Thank you FLICK!!! On Black friday I went ahead and purchased two WD Passport Studio Fire HD's (GREAT Deal). I easily backed up using SD. Could not, for the life of me why the "bootable" backup would not boot. NEVER would have given this a thought. WORKS PERFECTLY!!! Thanks for the post...
To Sum It Up: DISCONNECT WD Passport Firewire Drive. Boot, holding "option" key. When system pauses and list appears, plug in HD Firewire Drive. TaDa!! It now appears as a BOOTABLE option!!