[pigbite]

KNX is an excellent choice, especially if you are thinking of integrating other systems such as heating, blinds etc. and could be accommodated. CAT5 wiring is not KNX approved but it is possible to run the bus over it therefore you may find that a KNX installer would work with it under certain caveats.

If you've star wired CAT5 from each switch then another option would be to use the CAT5 cable with KNX binary inputs and simply trigger events using retractive switches. This would have the added benefit of being pretty cost effective as well.

My second choice would be Rako as I find that pretty robust as a wireless option.

HTH

jez