I'm running a hyrbid ATO system using the JBJ controller, a 12vDC power supply and the pump from the Tunze osmolator (all innexpensive). Works awesome. Bought the JBJ controller used and has been running for 6 months without any problems (I know some people have complained about reliability problems with JBJ ATO).
I have a comment on the post above; mechanical & gravity fed is the simplest, but eventually all systems fail and I'd be worried about failure (flooding) in a gravity fed system. Atleast in an electricly pumped system it's most likely method of failure is to not work at all....
As for the FW resevoir size, it's simply a matter of how often you want to be refilling it. Larger the better as you won't have to fill it as often. Sounds like you know how much water you're losing, so you can decide how often you want to fill the resevoir. My one comment there would be to have better than a week's water in there so that you can go on vacation without having to worry about water top up.
If I understand correctly you're considering using a wavemaker in the FW resevoir? I really wouldn't see the point there... There's next to nothing in the RO/DI water to go stagnant, and oxigination's hardly a concern as there should be nothing living in there anyway.
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