Honestly recommend coco/perlite, fabric or airpots. feed 1-2x daily, 10-20% run off, you can get some good growth at a fraction of the price and hassle. IF you really want to use a res consider drip irrigation or autopots,
I had been wanting to try rdwc after my first dwc run, I hate the fact that I cannot leave a trellis, and having to move her entirely when changing the res 2x a week.. I could either cough up the money for a hydrabucket, meh, or build my own recirculating system for my 3x3, and honestly I think it would be more of a pain in the ass, considering the potential problems that are carried along with it. and my grow environment.