Did you have much difficulty getting Ubuntu running? I couldn't get Fedora to boot from USB or HD, even using rEFIt. I suppose I could check out Ubuntu again.
Thanks for your input; I appreciate it.
Best way to do this is to partition your first drive into 3 partitions before installing OSX using disk utility pre-installation. Install OSX, bootcamp, windows, then linux. Then you're free to remove your dvd drive if you prefer using a hard drive in that bay, but you'll need the drive for OS installations.