I just need to update this with some new things I've found to like about Pizza Heaven. First of all: the vegan cheese they have here is delicious. I didn't know they had it and was stuck getting lousy Z Pizza when I was eating with my vegan or lactose-intolerant friends. Not only does it get the job done, it gets the job done well enough that no one, not even me, misses the real cheese.
Second: Not only is Pizza Heaven is open on Sundays, it's open until 10 PM on Sundays. All those pizza restaurants that think that no one really NEEDS pizza on a Sunday can suck it. Sometimes no other food will do. And luckily for Phoenicians, they have an excellent family-owned option when that Sunday craving hits.