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I think you need to consider matching the filter set to the OTA you intend to use. For example, some APO refractors can benefit from the Astronomik Deep Sky RGB filters that block more blue than the Type II filters. And, that same blue consideration can influence what filter you use for luminance. If the pass frequency range is too wide the stars may not be as tight. If your consideration is only NB imaging maybe this doesn't matter.
I did view a very nifty filter wheel made by Optec that will hold 2" filters. It is compact and will allow carousels to be swapped out without removing the wheel. I now greatly regret buying a huge SX wheel that interferes with tracking past the zenith....
Peter
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