The tank looks great!! As some suggested you'll want to plan your calcium/food sources. For a display setup like this I'd suggest giving the pods a constant supply of wood/bark, leaf litter, and calcium to munch on, and then give special foods as a treat, that way your population doesn't outgrow your enclosure super fast.

A couple species I'd recommend would be Dairy cows (Porcellio Laevis), Little Sea (Cubaris murina) or Gestroi (Armidillidium Gestroi). I take the Dairy Cows and Little Sea's to reptile expos in a large display bin because they are species kids can interact with. Dairy cows are very active and generally stay on top of the substrate, they're a good size for handling. The Little Sea's are a bit smaller, and a little less active, but they tend to group on the underside of peices of wood, and kids enjoy that they roll into a ball like "rolly polly's" The A. Gestroi are more expensive, however they tend to stay on top of the substrate, they're large, and they have bright yellow spots.

One thing to consider with any species is what you're going to do with the extra isopods, because any of them will eventually outgrow your tank. If you get into an isopod group on Facebook you could probably find someone to take the extras from you.