this is the best deal around...Zandor designed it... http://boards.cannabis.com/showthread.php?t=47317 If I didn't build all my own stuff and I know where to buy supplies for this unit!: I would Buy this...
This is a small system...They have 40 site units and these are custom made by a guru,(so to speak)...

Ebb and flow/flood and Drain is a big tray about 6-8"s deep and it has a fill tube in the bottom and an elevated drain...you fill it with hydroton and have to regulate your flood intervels...when pump comes on...It fills up to the drain level and then the plant feeds...I have never grown this way, but Stormcooker has some thread on it somewhere...go to 4hydroponics.com/Growco and look at systems...

I would still try and get Zandor's...It is just what you appear to be looking for...lw