your bios is likely to go to raid drive and raid drive then linux drive?
grub sees raid as ONE drive so to confirm see my trouble shooter
root (hd AND PRESS TAB to output all the hd types grub can find
if I am right it will only find hd0 (raid drives 1 and 2) and hd1 your linux
then boot into linux and amend your /boot/grub/menu.lst to change that hd NUMBER for linux
btw I am assuming grub is on the same drive as suse linux?
but grub can go on all 3 drives.
It is probably better that you change to bios boot to suse drive amend the menu to change hd NUMBERS and do the same for MS to hd1