Hi everyone -
I'm leaning towards using Z-Wave with Arduino driving the controller. I've looked at a few different controllers, but the interfaces into them aren't that clean cut. Right now, I'm thinking the best path is to get something with a serial interface (such as the HomeSeer Z-Troller - http://store.homeseer.com/store/HomeSeer-Z-Troller-Z-Wave-Controller-P214C66.aspx).
Has anyone else done something similar? If so, what hardware did you use and how did you interface to it from the Arduino?