First time I voted under apartheid would have been for National Party (the architects of apartheid) basically because there was no choice. (Although my local MP was FW Botha, the prime minster who dismantled apartheid).
Once the ANC were unbanned I voted for them, but economics played less of a role, it was more about human rights. (The ANC Freedom Charter is an amazing document
http://www.anc.org.za/show.php?id=72).
If I was in South Africa now, probably the DA - to strength the opposition - as, in my opinion, the ANC is not governing true to the Charter.
BTW: I really do identify NZ as my home country now, I was born in England, spent 30 years in SA, but now am well and truly trying to be a kiwi, hence my interest in the politics.
This is my second election here, last time I voted National party vote (cos they had better advertising I think, I was pretty uninformed) and Labour for my local MP (cos I had met her and she seemed a good sort).