Black neons are neat fish, but like most schooling fish, they're kinda jumpy and they like to run and hide when something approaches the tank. If I walk by, they shoot off to a corner and hide behind rotala. If I have a seat for 30 seconds or so, they come back out to pip around.
Dwarf Gourami fish are cool looking, but I am partial to pearls. They're energetic and fun to watch. They'll eat anything they can find - great if you have nematodes free swimming. Mine also bites snails in the face for fun, randomly. Pearls are also very cheap - usually less than half the cost of a DG and they are larger and better able to cope with faster moving water.
By the way, the aforementioned DG health issues - Many DG imported currently suffer from Dwarf Gourami Iridovirus, which lies dormant for a year or two and then atrophies and kills the fish. The fish will usually become lethargic, rest on the bottom and then change color as the flesh dies - sometimes a long and painful death. DGI is known to jump species in some cases - part of the reason I don't mess with DG.
Edit: In fact, I remember a posting from a couple of weeks back where a UK member had a DG that started to color change and died shortly thereafter. DGI is present when the fish are bred in the far East - unless you can find a reputable local breeder, I'd steer clear.