Unfortunately, I cannot help with specific Z-wave devices (I am a user of insteon). A friend of mine uses a Honeywell (Z-wave enabled) thermostat and has no complaints, but does not integrate it with any lighting system or controllers (accessing it only through the web, apparently).<br /><br />I also do not have a dedicated security system but the Elk is the one mentioned around here most frequently. I understand it to be quite DIY friendly and, no, it does not require a contract or monitoring agreement.<br /><br />Hopefully, others will jump in here.