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I did the same thing as you Martin started on a canon 600d, purhcased up 2" filters for future proofing (ended up with a qhy22m then a qhy163, and now finally need the 2" filters with a zwo 6200.
I don't think you can really go too wrong, these days it seems most filter makers have reflections well enough under control. ive got baaders / astronomiks they do well enough for me, its more question if you want the best of the best then you have to pay a lot more for it. its really personal choice, there isn't really a bad choice. I have seen people post the differences going from 6-8nm down to 3nm and there is some improvement - will most people see it hard to know?
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