I agree with you that wireless has its downfalls. However, unlike wifi, aware uses an infinitesimal amount of bandwidth. Also, my understanding of is that zwave (unlike wifi or LWRF) both broadcasts, relays and receives messages. Therefore, the more zwave products you have the better range you can achieve. Unfortunately, I have found no golden bullet through the forums in the lighting arena. Even the likes of Lutron have their very vociferous detractors.

However, I'm hoping that a combo of zwave and comfort will work for me.

As for wired vs. wireless I think that you are very right in saying that wired is more secure. Budget not being an issue I would probably would have gone for velbus or the Like.