I love my center: Camelback Dialysis in Scottsdale. It's a small DaVita clinic - only six chairs - and they primarily train and support home patients. They are also a self-care unit if that's what you want to do (or you can just sit back and let them do it all). The staff is great and their stats are phenomenal.
You're coming from Wisconsin, aren't you? Ever spent a summer in Phoenix?