When I lived in Phoenix, I volunteered for an animal rescue organization. We did pound rescue, so we seldom had any pure bred dogs, although it did happen on occasion.
I think it's great that you are considering rescuing. All my kiddos (three dogs, one cat) are rescued. They are the loves of my life (and Jake, I love them even though they don't buy me expensive jewelry
). Anyway, I haven't read your link yet, but try to make sure that the rescue organization finds out as much info as possible as to temperament. Rescue dogs CAN be difficult, because they've been in some sort of bad situation, either abuse, neglect or abandonment, so they usually require a little more love and patience. But it's SO worth it, when you get their loyalty and love.
Good luck in whatever you decide to do!