Here's a few to think about:
Powder Blue Dwarf Gourami
Rainbow Shark
Kribensis Cichlid
Dojo Loach
That's what I have in my 29 gallon along with 5 glo-tetra. They all get along fine and show nice personality traits. The Glo-Tetras (hybrid black skirts??) are a little boring but the rest sure have a good time.
1 angels will be alright. Dwarf gourami would work, or 6 cory cats, or 5 small loaches like yoyo and striatia botia too. Rams, rainbows, and keyhole cichlids would work too.