Why would you want to buy in Cape Town? The property bubble over there is as bad as the UK. Bear in mind that salaries are significantly lower.
have a look at this, from an independent property economist:
http://www.rode.co.za/news/article.php?ID=2117The rental market is saturated by BTL investors, and CT has never had a decent rental market anyway. You can rent fantastic apartments for a fraction of what they would cost to buy. Interest rates are at historic lows and the Rand very strong, so all the good news is already in the market.
You will be able to get something quite good if you decide to buy, but then bear in mind 20km from CT could put you in the middle of a township! Not good for your life expectancy.
If you're going to study/work at UCT there are plenty of flats nearby, you could rent until you find if it's really worth buying...