Yes Zebra is a must.

Others to think about include:

Blue wildebeest;
Black wildebeest;
Bushbuck - one of my favourites;
Duiker - various species;
Some of the other 'small guys' - depending on where you are - steenbok, klipspringer, and .... ;
Hartebeest;
Blesbok;
and of course Eland.

A .30-06 will handle them all, eland is a big animal however.

However many recommend heavier bullet weights and for good reason. I would use a minimum 180 gr bullet or a 200 gr bullet. Of suitable construction.