To be honest, I'd like only flora, no fauna. Just something that is fairly easy to take care of, I've got enough tanks that require time.What are you planning on having live in the viv? That really makes most of your decisions for you.
Nice, I just did a search, some great looking plants!If you're going with just flora........go carnivorous.......sundews and pitchers. There's a carnivorous tank in these threads somewhere, i just forget where.
That set-up is awesome! I got linked to it when I first asked about carnivorous plants, also got linked to a site you can order them from.this has to be the finest carnivorous plant tank i have seen to date. i'm sure you've seen it, but i figured i would post it anyway.
Indeed, I've found most prefer the open top rather than high humidity. miniature orchids would be a great choice as well. There is a great thread on dendrobium that is set-up like a swamp with a bunch of orchids - unfortunately the OP is in Mexico, so he has access to plants we don't .You can keep carnivorous plants in a terrarium, but a lot of the best ones don't really like to be in an enclosure and would rather be outdoors.
Another group of plants that is incredibly diverse and so interesting are various miniature orchids, especially pleurothallid orchids from the Neotropics. Many of these kinds of orchids can grow and bloom really well in a humid viv setup.