1. Nope (BTW are u using IDE or sata hdds?)
2. Yup. So?
3. Yep. Kinda.
Just do 1 thing. Install OS X in one hdd and XP then ubuntu in the other. then add an entry for OS X in GRUB. Now keep the OS X hdd as the secondary one.
I have formatted my second HDD and not it's primed for Mac. As suggested I would remove the other HDD temporarily; make this one primary and install Mac OS on it.
Then I would connect the XP/Ubuntu HDD, make that primary and the Mac one as secondary.
Now can you please guide me on how to add an entry for Mac in Grub?