Check out Tektite skies. It uses any all sky camera feed (it can even compare pictures saved to a drive) and applies a Safety Monitor to it.
Cost is cheap, has a 40 day demo.
http://www.mcdougalltech.com/page1/page1.html
But yes, I've used PHD2 as my test too. The downside is that by turning off recovery mode, you lose a night to an errant cloud. Personally, my favorite dector isn't a cloud sensor (it's fickle) but the rain sensor on my foster astro alert. It's pretty amazing (look up Hydreon rain sensors).