nice tank,
like said keep the angels as the main fish and work around them.
you could have plecs,corys,tetras, maybe some smaller type of cichlid like rams or kribensis.
for that sort of tank i would do this;
Put some nice shapes of bogwood in
put some plants that dont require lots of light and CO2 like amazon swords
then have the pair of angels,
a school of 12 tetras, personally rummynose, but they may get eaten if the angels are small and grow up with them they shouldn't is not you could get a larger tetra like black phantom's
then a larger school of corys, corys come in many different colour forms some like colder water though so look through the fish index.
a pair of german rams
and a bristlenose plec.
that would amke a lovely tank in my eyes but its only suggestions!
DA