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You might want to consider getting the double stacked version of the SM. Single stacked coronado stuff is less than spectacular. I think though you would be better served by getting a ed80 scope with the double stacked SM40. You will find more enjoyment in the long run. I have a double stacked PST and I am very happy with it. I will eventually move up to a day star filter when solar max starts to proceed.
I have not heard anything about coatings of some refractors affecting performance of filters in Ha light though.
This is one of the most costly parts of the hobby and I would suggest thinking long and hard about your choice. I can recommend the doublestacked PST, but it is not a much fun for observing as it is for imaging.
Best of luck with your choice.
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