Good plan, Alrik <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
Hydras are cool, and I don't think I've ever seen one in a CRPG. All the multiple heads must be pretty hard to animate convincingly I guess, but it'd be one heck of a problem to beat one. I think we could skip the 2-heads-for-1 thing, though. I should imagine that would be almost impossible to implement.
If flyers are in, manticores would be good. Dangerous from a distance and up close, and they can fly.
For some reason I like the idea of four-armed minotaurs, too.
And yes, I do like a challenge <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" />