What would I like? In an ideal world, I wish Shout Factory was a little bit like Funimation or Viz so they could dub the shows for DVD. But since we are talking a very niche market, I would settle for the dubs that already do exist, alongside their Japanese tracks. Sure some of the dubs are notroiously a bit corny, but I really like them, though I only watched Bioman's and Solbrain's dub.
-Bioman with the English dub. Maybe release the Bioman Saban pilot as a bonus feature.
-Turboranger's English Canadian dub.
-Dynaman, with its comedic Night Flight dub as a special feature.
But outside of those, Sun Vulcan [if they could get the Marvel as a special feature if it still exists, that would be cool] and the Marvel era of Sentai, maybe even partnering with Marvel for a Supaidaman release for a few things as well as Battle Fever J. Outside of that era, it has to be Flashman, Maskman, Changeman and Jetman. I really want to see why Brazilians really love these shows enough that they literally were Brazil's equivalent of MMPR back in the 80's and 90's in terms of popularity.
The Sentai I truly really want to come here are Gingaman, GoGoFive, Carranger ,Abaranger, Hurricanger, Dekaranger and Ohranger, since they incredibly differ from their American versions in tone or story, if not both. Their footage was in my favorite Power Rangers seasons as well.
For shows, Solbrain [with dub], Spielvan, and anything Kamen Rider related from Black to Faiz. I would definitely go and buy Kamen Rider Kuuga because its one of the strongest Rider shows I've seen. And the entire B-Fighter franchise, if possible.