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The similarity in price between the dedicated scopes and front mounted filters is due to the fact that the dedicated scopes use a smaller (and therefore cheaper) internal etalon. The trade off with the internal etalon setup is that you may have a 'sweet spot' that is on-band while the outer margin of the view may not be, and thus not showing the same detail in this area. The degree to which a sweet spot affects the view varies between scopes and owners of the Lunt80 suggest that this is not much of an issue with that particular scope.
I own a large aperture h-a scope, but the 60-80mm aperture range seems to be a good spot to be in terms of resolution, price and portability.
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