These would be my picks for eight new antelope (including a clone species instead of an exhibit animal):
1. Yellow backed duiker - the biggest of the duikers that inhabits both rainforest and savannah habitats and can be mixed with many species from both biomes
2. Blackbuck - one of the more common zoo antelopes that would add a new desert and grassland species from India
3. Common waterbuck - another of the most common zoo antelopes and fairly docile, being able to be kept in many different mixed enclosures
4. Giant eland - not commonly kept at all now, but it is the largest of the antelopes and is also a threatened species
5. Four horned antelope - absent in zoos outside its native Indian Subcontinental range, but is a unique-looking, threatened small antelope that is being bred in captivity
6. Gerenuk - another species that is rather uncommon in zoos, but is a charismatic species of antelope
7. Kirk's dik-dik - an ideal small antelope that is kept in both large and small zoos as well as being mixed with larger hoofed animals, aardvarks and meerkats)
Clone. Goitered gazelle - a cold-hardy species from Central Asia that is very similar in appearance to the Thomson's gazelle, albeit slightly darker in colour)