Only you can answer that question. The guidelines in this thread are meant to get you started down the path to better beer. It's strongly implied if not explicitly stated that you must experiment to determine what level of minerals gives you the beer you like best. I can observe that most people like beers made with low mineral water backed up with some chloride. That's the basis for the Primer's recommendation of RO water with a fair amount of calcium chloride supplement.
IMO you should brew your favorite style with the undiluted (pretty soft and low in sulfate) water and then again with diluted water. Pick the one that gives the best beer. Then adjust the calcium chloride addition until you hit your sweet spot.
IMO you should brew your favorite style with the undiluted (pretty soft and low in sulfate) water and then again with diluted water. Pick the one that gives the best beer. Then adjust the calcium chloride addition until you hit your sweet spot.