What about "Duet" as an idea for a sampler disc.
Going by TNG, they had the pilot, a dark, set-bound episode, and a fan-favourite with a lot of bright, open scenes.
Translating that to DS9, maybe they could have something like Emissary, Necessary Evil and Indiscretion?
I don't think there will be a sampler though. For TNG it was a much-needed proof of concept, and filled the long gap between the announcement of the project, and the release of season one.
With DS9, we have an idea how good it will look thanks to TNG, and of course Birthright. I guess they'll just go straight in to season one.