looking at this also in an expansion
really the thng i am only concerned w/ is that all really have to be used on the same nutrient levels
i don't dislike dwc the results are great in size and i don't use full ro water and it doesn't spike as much for the ph
the next turn around i was looking at the ph perfect as well a friend uses it and says he only lets chlorine disipate in the holding res and get bubbled never even checks ph
really i rarely check it either

you know that but in the long run it sounds really plug and play w/ a great buffering it is pricey but you really don't have to factor in ph time if your water is half ok
he uses half r/o and half city also
Glad to see RETIREMENT setting in now if you can just hide out in the expansion enough from the mrs. over the next couple of years