I’m partial to BRS units mostly because of modularity, ease of use, and relative cost. Depending on the your planned usage, aquarium size, and budget, I would recommend different course of actions. I do however believe the 5-stage units are a good general place to start and can be modified later to add more canisters if needed. For efficiency I’d also recommended their dual RO membrane as that cuts waste water in half.
Your water quality report is somewhat easier to follow than WSSC’s. My big take away was that they don’t use chloramines as a disinfectant. That being said, you can use regular carbon blocks. I have been using 5 micron pre-filters without any issues and change them out based on color (which is well before any noticeable pressure drops). I also change out my carbon blocks at this time so again it’s well before they are depleted. I’ve never tested my source water but I suspect it’s pretty low TDS as my DI resin seems to last forever.