If you go for hatchets, be sure to cycle the tank really well beforehand, they are very sensitive and are also very prone to Ich. My LFS imports some every 3 months and they ALWAYS get Ich in his tanks. When you add this to the fact that neither they or the apistos do well with medication and you could end up dissapointed.
The Checkerboards (Dicrossus Filamentosa) are a superb little fish, really one of my favourites. They are usually small and not very colourful in the shops, once they get older they are truly gorgeous and have quirky darting movements, moving forwards in little jerks as if they are being 'followed'!
You could easily breed a pair of small dwarf cichlids in a tank that size, the expierience is truly fascinating and takes fishkeeping to a higher level, a pair of mature kribs(african, I know!) or Apisto Cacatuoides (Cockatoos) are easy to moderately easy to breed and may tolerate some dither fishes such as tetras provided they dont get too close to the fry.
Good Luck!!
Ken