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there are plenty of options out there for decent NB (dual) filters for an OSC. I personally use the IDAS NBZ (so you do not get halo's), and sometimes use the L-Optolong Extreme when I'm imaging certain targets as it has a narrower bandpass as compared to the IDAS. The L-Extreme will give halo's on very bright stars.... (just saying). I use the 2600 OSC, and the dualband nb filters, and also add in a Sii filter on some targets. Some may call that crazy, however after 12 years of doing this hobby, I enjoy making an OSC perform as good as a mono, as there is a dark art in post processing photons.
I would also suggest it is definitely worth exploring, have a look a cuev the lazy geek's channel on youtube. Personally I would stay away from any of the tri-band or quad band filters using an OSC, why - well it's a waste of money on the tri-band (it's not Sii/Oiii/Ha - it's Hb,Ha,Oiii) and quad bandpass filters tend to cause a few issues on OSC sensors.
If i had to recommend one above the rest - IDAS, wins hands down.
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