I'll give that a skip thanks - way too expensive. I want to put together a fairly decent machine but not a top of the range one that I'll have to sell my soul to afford
I see that because the HD4890 has been released, the prices of the HD4830/50/70 have all come down, if you look around, you could pick up a HD4830 for about R1500!
Further more, it's to my understanding that the HD4770 will release soon which has ddr5 and a 128bit-bus interface, and it will be around the R1500-R2000 bracket in South Africa and it performs between the HD4830 and HD4850. Looks to be a very nice card, is on the newer 40nm transistor size and thus will ask for minuscule amounts of power

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I think you should wait a bit for these graphics cards to lower there prices and what not.
As for CPU, maybe a 3 core or 4 core cpu as those are quite cheap now, and you can get an AMD X3 720 black edition that begs to be overclocked and it's quite stable at 3.6-4ghz.
DDR2 ram should be more then fine
A nice 500watt Power supply would be nice and sufficient in this case
As for a mobo, if you go the AMD route, then go for a 790gx/fx mobo and if you go the intel route, don't go for anything lower then a P35 mobo.
I think if you want a nice pc with a decent longevity you going to have to spend around R8000-R10000 hey. I guess you gotta break eggs to make an omelet