I need one of these babies, although I also can't afford it, but maybe I can sell one of my kidneys... you only need one right? Hehe. Anyways, I think that you should be able to dial in a range of different frequencies with this wavemaker, since if you couldn't, it wouldn't work on such a large variety of tanks. I think the controller may give you dynamic automation of the waves in your tank... possibly being able to change the frequency a couple of times in a day. That would be so awesome.
I really like the fact that the wavelike action will blow off the crap that collects on the liverock from fish, snails, etc.
Peace,
John H.