Whole house filtration suggestion

I have horrible water issues with my tank. I have a 6 stage RODI that treats anion resin-like its candy. I want to get a system for the whole house and then still piggyback on my RODI for the tank. Even when I replace every filter for the RODI, the lowest reading I can get is 2 TDS. That’s every single filter, resin, and membrane! I’m hoping this might help? Does anyone have an issue with well water and do this? if so, what whole house system would you suggest for about $500-600?