I don't really think there is any "true" substitute for Centaur, but there have been some great suggestions in this thread. I would put Fathom, Embryon, Flash Gordon, and Medusa at the top of my list of pins I enjoy from this era. I also think that Vector looks really cool although I have yet to play one.
I'm also really digging my new Black Hole right now. The game is just brutally tough and I can only manage to get multi-ball about 1 in 10 games. You'll have to stop over soon to try it out!