I'm looking to upgrade my Ro/Di unit for better GPD and waste. The spectra pure MaxCap Performance Plus is a 1:1 with some added accessories but 600.00. The BRS water saver would be almost 150.00 less but I would be missing a few minor accessories and I haven't found anything on water to waste output. I've always used SpectraPure in the past so no experience on BRS units. Do we really need a 5 or 6 stage unit in the front range (Arvada) or would a 4 stage work?