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Omega Optical (who own and make the DGM brand) also market a more modestly priced line of astro filters. I took up their OIII + H beta filter, and had it pooh-poohed by supposedly "knowledgable" people.
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Just an FYI on the Omega O-III: This filter was tested by myself and 8 others against the Orion Ultrablock filter and they performed exactly the same because the bandpass on the Omega O-III is quite wide.
I have since scored an Orion O-III which was tested against the Lumicon O-III and it was very close in performance. The Orion Ultrablock is also a nice filter to own if you're on a budget. The very best are the Lumicons.
Cheers!