Buy a samsung or WD 1TB drive from kalahari, add a decent enclosure and you have the best deal around, that's what I did and will just cost a little over R1000.
Edit:
noticed that the discount has ended so the 1TBs are not that cheap at kalahari.
SAN = storage area network (stand to be corrected)
nothing wrong with buying from cna IMHO,
i bought my ext 750g hdd from them, no problems yet..and it's esata
it was a bit pricey but i didnt have cash so i used my account.