Can the scenes taken be the length of around 7920 minutes?
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But seriously - to show off Blu-Ray, go for the gold and not token scenes from just a popular episode unless it can really show how great the added definition is. Any scene with characters with silk clothing or intricate patterns will show off what Blu-Ray can do. Any number of scenes with Quark would show a huge difference between night and day the SD originals and HD remasters. The Wodi (from "Move Along Home") had outfits would also show real wonders in HD compared to the SD original. And, of course, no moire that videotape is infamous for producing.
As for "Tribbles", they would have to do a lot of film editing for any 23rd century scene to cut in the different film sources and that seems unlikely to happen. Never mind how banal 60s Trek sets unfortunately were - they work but the richness in DS9 needs to be shown off to increase interest enough to make blu-ray look like it's worth the investment. Even over time, broadcast sales would make up for the cost but, as for TNG, I'd be there on day 1 for each season to purchase.