If plants are the priority, I'd recommend a 1M/2F Gourami trio, 12 Tetra (Rummies are my fav, but most should work well), and 6-8 Cories. None of those would harm the plants considerably (the only exception would be if the Gourami mate and he builds a nest) and would make for an interesting tank IMO. Hatchets or Rainbowfish would also be an option in place of the Tetra. There's a ton you could do... you could replace the gourami with Rams or Apistos, Tetra with hatchets, cories with smaller loaches, etc. It's really about what appeals to you and what you want to watch for the next few years...