I'd strongly recommend the PCS SS1L/S Smart Switch. You can read all about it on the manufacturer's web site at http://www.pcslighting.com/

The scene is prgrammed with your IR543 by putting the switch into a programming mode and then sending various X10 commands to set various switch settings. It's pretty easy once you've done it the first time.

You can buy the switch at this link: [Link: homeautomationnet.com]