The 5 in bold could be a possible focus for you on the hunt.
I'd say ask about that Oribi permit now.
Permits and range can create some of the difficulty. I ranked them easiest to hardest in my experience and others will rearrange that list and will get no argument from me.
- Common Duiker (also called Gray Duiker or Bush Duiker)
- Steenbok (also known as Steinbuck or Steinbok)
- Klipspringer
- Red Forest Duiker (also called Red Duiker, Natal Duiker or Natal Red Duiker)
- Blue Duiker
- Cape Grysbok (also called Southern Grysbok)
- Sharp's Grysbok (also called Northern Grysbok)
- Oribi
- Damara Dik-Dik
- Suni