Just for information, and I dont want to influence anyone's decision on what X10 devices to purchase, but the plugin I have been working on is for the CM15A controller (I purchased from here ->
ActiveHome Pro USB Transceiver and Software SW31A and CM15A - X10). The reason I went with the CM15A was simply because it supports all house codes (up to 256 devices.) Im not sure if the plugin will work with other serial controllers as I do not have one to test with...