[Saturn488]

I primarily use my ZWO LRGB 31mm filters and also using my H-Alpha a bit more.

After getting very good results I am looking at buying a set of narrowband but keeping the LRGB for a while longer. Looking at getting the OIII and SII and upgrading the H-Alpha.

Recommendations coming from ZWO filters? Looking at mid-range (please don't suggest Astrodon and Chroma, well out of my price range).

Tossing up between Astronomik and Baader and possibly Optolong? Possibly 36mm filters. Which nm should I be looking at?