-Six young angels. Let them pair off, and keep the prettiest pair and sell the others.
-A school of 20 or so rummynose tetras for the middle levels
-A school of 20 or so hatchets (silver or marbled, up to you) for the top levels
-A dozen yo-yo loaches or 20 corydoras (I like the loaches, but the corydoras are more in line with the South America theme)
-A trio of apistogramma of any species (one male, two females)
-A couple bristlenose plecos for algae control
If you aren't using real plants, be sure to have plenty of artificial ones. The angels will really appreciate tall grass-like plants. Plenty of lower, bushy plants would suit the loaches/cories and apistos. Round out your decor with some driftwood and rock piles for caves. A sand substrate would be ideal for any sort of loach or bottom-dwelling catfish.