In a similar vein I'm planning on installing lighting control in my house and possibly heating - when it gets built again

As I'll get some input at first/second fix electrics is there anywhere I can see how a z-wave controlled installation is going to differ from a standard electrical install, for example with light switches, dimming and dual location switching etc. All switches need to be two wire too, I'm assuming, not three which seems to be the more common zwave type.
Also I'm putting in zoned heating, so rooms will have programmable stats, I've only seen one EU stat from
http://www.horstmann.co.uk/products.php but can't see much detail on what zwave commands are supported on it, or if it will work in a zoned system.
Any one started from scratch with a zwave control based install? anyone have any comments or having done retrofit would like to have done something differently? Are Merten the only supplier that offer switch inserts?
Ideas?
-Coley.