Personally I'd go with one dwarf gourami. Females are hard to find, they are more silvery I believe. If you do happen to find females, most prefer a trio (1m/2f). I'd stick with just one though.
Watch out for the Golden Wonders. They get fairly large and have wide mouths. They were always stalking my smaller fish and after I saw Flo with a danio in her mouth I found another home for them.
The danio she caught had a bent spine, not the healthiest or the fastest, but several others disappeared before I found the killies a new home.
Neat fish though. Very pretty and friendly. Flo loved to be petted. Just not good tankmates for small slim-bodied fish.
They mostly stayed at the surface, but would regularly submerge and hang out at the bottom to watch for careless danios. They reminded me of pike or barracudas.
Ellen