I would avoid getting the Dwarf Gourami as it is prone to disease and you'd be lucky to have it survive more than 4 weeks. We owned a pair in our community tank and they came down with an infection and sadly died within a few days. We moved them into a hospital tank as soon as we noticed they were ill but no amount of medication helped.
The infection didn't pass onto our other fish as we had removed them quite early on, whether it's contagious or not, I'm not entirely sure.
To be honest, you would be better off getting some Honey or Sparkling Gouramies as they are very peaceful and don't grow too big.