At this point I will either use Harmony RF signals or iRule to talk to my Insteon system and control the lighting scenes. Have not decided which one. I went ahead and bought an ISY99 device to make it easier to set everything up but you can do things cheaper if you want to. You just need a few devices to be able to convert signals from RF or IR or Insteon or IP or whatever kind of system you have in place. All of the devices can be found on Insteons site http://www.insteon.com Sometimes there is better info on Smarthomes site http://www.smarthome.com/_/index.aspx
The nice thing about Insteon is you can buy just a few components now and add to your system as time and budget allow. Just do a little research on the sites listed above and that will get you started. I called them a few times to clear things up as well. The video tutorials are probably the best place to start.
The GE on the other hand is expensive to get your foot in the door and may require an electrician to install depending on your expertise. Once you get it set up I have heard that it is rock solid and more reliable than many other solutions. You just have to fork over the money of course. If I had extra budget I would probably look into the Radio RA stuff they have now.