I agree with a lot of the postings in this thread, the main being not leaving your home security to a PC !! I've put together a combination
1) Security - ELK M1G with ethernet interface
2) HVAC - RCS thermostat connected to ELK M1G
3) Automation - Homeseer
4) User interface - Main Lobby with a touchscreen
The ELK is relatively new in Australia however I started researching it when I saw it pop up in a Homeseer forum thread. The ELK is a very nice panel, have no idea if its price competitive however it was the functionality I wanted. Its embedded and wont fall over and thats why I interfaced the HVAC to it and not the Windows PC.
The RCS TR40 thermostat is a damm nice unit and I've **finally** connected it up today, once I worked out the old thermostat wiring. Its got an RS-485 interface that talks to the ELK.
Homeseer, well thats a world in its own right. It has an amazing amount of ability to just about interface to anything you can think off. I agree with the postings that the interface provided tends to be of "Engineering" quality, the scheduling engine is superb.
Lastly, Main Lobby. I can only say, if it wasnt for this piece of software, the WAF would not exist. You need a nice clean easy to navigate interface and combine ML with a touchscreen, you've got a REAL winner