This highly coveted award would have to go to Andrea Bianchi’s Burial Ground: The Nights of Terror, released in the greatest year of our Earth, 1981. I’m sure this has an intense, rippling fan base, but no one bothered to make me watch it until Brandon Fincher forced its essence into the deep recesses of my Galactic Ghetto Netflix Queue. Then, upon further prodding, it was bumped to the peak and delivered to my home last week.
The Nights of Terror has just about everything I want from low-budget Italian horror, and an entire pantry of things I didn’t know I wanted until I saw them. There are way too many highlights to mention, but Peter Bark’s performance as Michael and a handful of ideas jacked from Zombi 2 are good places to start.
A trailer, for those of you that haven’t seen it:
subhumanzoids 
I have that DVD sitting on my shelf. I should probably get around to seeing it as I continually hear it is the worst zombie movie ever made. I still think Zombi 3 holds that distinction.
It’s waaaay better than Zombi 3. Of course, this all depends on what your definition of “good” is, but I think you’ll enjoy it.