As a Chinese guy here in Arizona it's pretty hard to find any decent Chinese food. I mean, if PF Chang's is your idea of authentic, you need to get your head checked then come to HK Asian Diner. This fine establishment is one of the few places that one can get a pretty authentic Chinese meal. Just look at the usual crowd that frequents the restaurant and you know it's the real deal. I can't really pick any specific dishes out that I particularly enjoy, but pretty much anything off the "Chinese" menu is pretty solid.
In conclusion, get out of your comfort zone and try something new. The only thing that should scare you about this place is the HK gangster waitress. She may come off as rude, but that's just how they do it back in the home country so don't fret. Go there and you'll see what I mean haha.