I would avoid X10 like the plague. Between things like modern TV's and power strips, bridged power junction boxes and just plain strange wiring, X10 signals tend to just "disappear" and never get to their destination.
If you really want to give X10 a shot, I've got a box of X10 stuff in the garage that was worth $250+ new and it's all completely useless in my house, so you can have it. Some of it worked in my old house, but it won't so much as turn a light on 2 outlets away where I live now.
X10 is viewed by most modern electronics as "noise" on the line (which, technically, it is) and something to be filtered out rather than passed along or left alone.