Since I didn't have the 3rd disk, and may need it, I started looking to download it, and stumbled across a local copy of the 9.1 iso's at work. So I downloaded and burnt those, and whaddya know? It worked like a dream.
Detected and installed fine.
So there ya go, for anyone in the same boat, Mandrake 9.1 works sweet.
Thanks for the help all,