All of the control systems you mentioned are the best out there. Your decision should be based on what you like and the budget too. For the thousands you are going to spend, please go to a dealer for each product and get your hands on the controls. These interfaces will be the most expensive portion of the system( keypad, touchscreen, wireless touchpanel)
The Elan keypads and the New VIA touchpanel sure give a lot of options and controls for the money. They have a video switcher too in the Z series.
The PHAST and Crestron line have more choices in controls and design, but are clearly the most expensive out there. Make the right choice based on where and who is going to use the system. What you find easy, your family may find frustrating. All of these systems are modular, so you can add at will when the time comes( Elan Zseries, Phast Landmark, Crestron STS)
Make sure you use a seperate lighting control system that you can interface. Lutron, Litetouch and Vantage come to mind. If you really want to play with the x-10 stuff ( not recommended) use the PCS lighting modules. -jay
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