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Lunt and Coronado solar scopes are very good. there is also now a daystar (?) eyepiece that can be used with existing scopes for solar viewing in Ha.
You dont look for features, you need to first define what you want to observe or photograph in particular then look for what the features of solar scope will allow you the best view.
I have a double stacked Coronado, and it came with its own eyepiece which is just fine. The various parts of the scope can be adjusted to help you focus on the features you want, its not just about moving the eyepiece, its a very different beast.
Lunt seem to have the best options if you want to go beyond Ha like CaK. A white light solar filter on a regular scope will give you a fairly flat sharp image of the solar disc and sunspots. Generally other features are not visible with this filter.
Just a warning, don't expect to see in the eyepiece the images you see online. The "affordable" solar scopes are filtered to Ha so everything is in shades of red at the eyepiece and can take a bit of time and practice to get used to. Tuning in on various features of the sun can be tricky to adjust to.
I think it just comes down to Lunt or Coronado. Since you asked I can assume you are not studying a particular feature in which case you would be able to answer the question yourself. I believe the eyepiece filter for regular telescopes are pretuned for either surface or prominence viewing, but a Lunt or Coronado should let you view all the suns features
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