I saw that there was just a group buy on Koralia powerheads so I hate to do this, but they are coming out with a whole new setup. I saw them in action at the Pet Expo today. They look the same, but they run on 28volts and Hydor has a Tunze-like controller for them. You can adjust the timing, combination of pumps, power of the pumps, etc. They have a crest mode and tidal mode. The Wavemaker2 as they call it is supposed to retail at $250 and the power heads will be $20 - $40 each. Much cheaper than Tunzes. They do not say anything about them on their website, but they were selling them at the show for fish stores. I would expect that they will be available very soon. They looked like they worked well. We'll have to see.