I'd recommend the Lunt 60mm pressure tuned solar telescope. The views from this are almost good enough that you don't need to double stack, but if you decide to buy a second filter any tilt tuned filter should work - no need to return it to the factory for matching.
I've just sold one of these to fund other toys; the contrast and sharpness of the scope alone is spectacular; adding the double stack brings out greater detail on the disc (plage, filaments) though that detail was still visible in the scope alone once you know what to look for. The best contrast for proms and spicules is with the scope alone. Combined prominences/filaments look 3D as they arc over the limb of the Sun.
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