I would'nt actually advise spending above R3000 on graphics, because for instance : A R6000 9800GX2 is only about 20-40% faster than the 8800GT which is three times cheaper! (You need to run REALLY high resolutions to notice significant differences anyway)
But for that price, it would be smartest to wait till the
GTX 2#0 is launched in a month or two's time.
Till then I'd just buy an 8800GT and sell it for 80% of what I paid for it in when the new cards are launched
The Antec 900 is surprisingly quiet.. I think Antec uses very high-quality ball-bearing fans. (At least for the top 20cm fan.)
The case I have ATM (Aerocool Zero Degree) has got 3x12cm fans, a 25cm fan and the Zalman 9700CNPS CPU cooler, and I'm still impressed with its quietness.
I think the fan on the graphics-card is louder than all the rest combined (when it gets too hot)

, so having all the other fans is actually nice as it keeps the GPU cool too.