I don't know for sure if other controllers utilize the x10 technology.

Jose did show me some neat x10 stuff at his house when we moved your tank. They sell x10 controlled wall outlets. So instead of plugging in a x10 device into an outlet, its already built in. I don't want to knock it too much but I have just heard them not turning on or off sometimes. Bill even said he has had his lights turn on in the middle of the night! (haha)

If you limit the x10's to their own circuit, you might prevent any other electrical noise in your house from interferring with them.

The DC8's are a little pricey, but if you go with the Jr. you can get the Jr w/ serial port + DC8 for under $300. All you would need to buy is a pH probe. The DC8 runs ~ $170. They also sell DC4's too.