Well there are ALOT of options.
You can get a school of somethign such as cardinals, rasboras, barbs, black skirt tetras, Lemon Tetras, Serpae Tetras. You can even mix some of the schools.
You could also get 3 gouramies (i prefer honey) with some mollies or swordtails at the top. Then at the bottom you could add RTBS or a school of cory's.
You could even add 2 rams and some other fish.
You could add angelfish also with other fish.
You could go with a couple rainbow fish.
There are still alot of options out there.