Yeah I was going to say the III one is surprisingly good. I used to know the director and he was super cool. Also produced re-animator. He also did a weird low budget movie called "society" which is interesting.
There are a few horror and sci fi movies with similar themes to Society that all came out around the same time. Society is probably the wildest. Worth a watch.
My favorite zombie flick, if you've not seen it you need to!