all personal opinion. my favorites, in order are:
1. orino
2. intermedia
2. ocellaris
3. kelberi
4. mono
5. azul
6. xingu
7. tem
these are most of the species seen/kept in the hobby
1. orino
2. intermedia
2. ocellaris
3. kelberi
4. mono
5. azul
6. xingu
7. tem
these are most of the species seen/kept in the hobby