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Hi Catherine,
A full aperture solar filter for your Mak-Cass would be cost effective, but it is not the same view as H-alpha. Look in the images sections of this board for "White Light" solar images to see what the view would be like. There can be very detailed views of sunspots, surface granulation, and faculae, but you can't see prominences with this type of filter.
The H-alpha etalon filter is a different beast. It is a very expensive piece of precision kit, but it's the only way to see prominences and swirling on the surface. I doubt you could get one large enough for your Mak-Cass. You probably need to get a 40mm to 90mm refractor. For example, Meade and Lunt make H-alpha scopes in this aperture range.
Good luck with whatever you choose.
-Ivan
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