I just set up a system like this. Cost me probably $80.
Ingredients:
*1 submersible pump to mix your nute mix in the reservoir. Apparently the Dutch are convinced that this circulation is superior to an air stone for aeration, so you needn't get one of those. I use a MaxiJet 1000 - cost around $30 and is probably twice the pump I need for this. It is nice because it has suction cups and a mount that allow you to just turn it on its side, attach a tube to the outlet, and it will mix nicely. The other important part about this type of pump - and this is key - is that it will not be a fire hazard if it runs dry.
*1 submersible pump to pump your nute mix to your plants. I use an ECO 264 which is also about twice the pump I need. It does about 2 quarts per five minutes when watering two plants. I actually wish it were slower since my timer only has minute precision. Because this guy will only run a couple minutes a day, you can probably get away with a pump that isn't designed to run dry, but I don't see the point in not spending a few extra dollars to avoid total meltdown.
*1 timer with minute precision
*Irrigation stakes for as many plants as you want to water. These just anchor the irrigation tubing in position in the pot, nothing more. If you couldn't find them, you could get creative and do without.
*5/8" ( match to your submersible outlet ) flexible tubing. Get enough for between your reservoir and your plants.
*Small irrigation tubing (mine's probably around 1/8" OD) that fits your irrigation stakes. You need enough of this to run from your main outlet line to each of your plants.
*Several zip ties.
*A reservoir. I use a five-gallon bucket, but I'm only using it for two plants right now, which gives me about ten days worth of watering. You can easily get a rubbermaid tub and do the same thing.
Construction:
Stick the circulation pump to the bottom of the reservoir laying on its side (outlet directed parallel to the ground rather than upward). I attached a short piece of the large tubing to direct the circulation, ensuring that it wasn't directed at the inlet of the irrigation pump and mixed throughout.
Cut two holes in the top of your reservoir lid: one for wires, one for the outlet tube.
Figure out where you want to run your outlet tube. Ideally, it will be above the level of your plants, so that if you get slight leaking from the connection between the tubes for the individual plants and the main line, it will run down the line to the plants. This also makes it possible to have containers of varying heights without it affecting the water flow because the tubes are directed upward. It's also best to position it so that the smaller stake tubes are of relatively similar length, as this will also affect flow.
After you have determined how long the outlet tube must be, fold it over on itself a few times and use a ziptie to terminate the line.
Cut the smaller tubes to be used for individual plants to length, doing so at a 45 degree angle.
Push the sharpened ends of the irrigation tubes into the main line. Depending on the thickness of the tube, you may want to puncture it beforehand with a nail.
Secure the main line using zipties - I use the tie with the holes in the end to make this easy.
Throw the stakes in your pots, the tubes through the stakes, plug in the circulation pump 24/7, and put the irrigation pump on the timer.
Run it for a few hours to see how warm the water gets. Mine stays around 65-70, which is just about right, but you have problems you can always put the circulation pump on a timer as well.
Calibrate that bad boy and you're set to go.
Here is a crappy picture showing my setup. I didn't take it for this purpose, so you can't see the inside or the irrigation lines, but you can see the main outlet line, and how it runs into the box to the left. I'll take some more and write a DIY someday.
Another point is that you want to have all of the larger tubing (the white stuff here) high enough so that if water condenses, it does not collect on a lower loop and end up on the carpet (not quite the case here). For this reason, you should also create a loop in the electric cords so that any condensation drips cannot reach the outlet. That would be bad. I looped mine and ziptied them to a table leg.