I've just completed a refit of my house, and installed a velbus system which works with comfort! Obviously I am biased as I've just installed it, but the comfort system speaks for itself and velbus for me is an excellent system and meets pretty much all of your needs! Incredibly affordable, I got my units at 120 euro for 4 channel vmb4ry unit! Din rail
Modular system, same topology as knx/CBus!
I'm in the process of doing up an overview of my system, hope to get it finished next week!