First the XP3 does do IR routing, 3 ports of IR and one RS232 and you could put an ECB5 on each of those 3 ports. Plus you can use IP control that's discrete. What is your problem with the RM433? Using 433 is the BEST way. It's much more stable then Zigbee. But it's great to have Zigbee too!
Who says you can't put 61" plasmas up on cantilever mounts using toggle bolts? <---Thanks Ernie ;)