Need new RO/DI Filters

I am in need of getting all new RO/DI filters and a flow restrictor. My setup has not been funning for years so I am sure the filters are shot.



Which filters do you recommend? I know a lot of people like the spectra pure, but their filters seem a little expensive... Looking for advice. The system I have is like the one pictured below.



I usually run

1. sediment filter


2. carbon


3. carbon plus 1 (whatever that is)


4. Dual RO Membrane


5. DI Resin.

Is that the best setup? I see there are silica filters...