Firstly, I'm assuming that under 8.04 the dual-boot with
2 separate drives worked ok for you (allowing to select either OS).

It's possible that since you're using 2 different drives, that
GRUB got installed in its default configuration, and even
though these days, installing GRUB is safe to do with
dual-booting (provided it picks up the OSes you need)--

I am thinking that still it should allow you to use
the keyboard to arrow key and select something other than
default (Top of list).

I'm pretty sure you can edit GRUB on your HD -

You may/(may not) need to put a LIVE CD in your drive
and boot from it, and then under root privileges perform
necessary edits to your grub menu ("menu.lst" or "grub.conf") depending
on which version of GRUB you have.

Here's are forum links detailing dual-boot.

http://ubuntuforums.org/showthread.php?t=210409
www.linuxquestions.org/.../editing-grub2-207\
616/