Yes, if there is a possibility of wiring, then wireless should be avoided, i think. Wireless sounds progressive and modern, but i have an existing power wiring, so all what i need is to replace the current manual switches to something that can be controlled with LinuxMCE. The actual wiring goes through the actual switches, so the fact hat they need to be connected to a wires does not matter. I think a wired solution is more stable and reliable. With wireless technology there is a potential risk of bad transmission, which can be avoided with wired technology. And wired will be cheaper, cause the switches are simply. They don't have additional wireless transmitters.
For the lights looks the best the PLCbus
But still have no idea with the home security and climate. Can this be controlled with PLCbus or i need something additional?