you could run the system flawlessly with 3 fans.
-one intake/hdd/lower area
the CPU and exhaust should be 120mm fans, the intake could be a 92mm.
i don't see why you would need more than that. you don't need to put a fan somewhere just because there's a place for it on the case, thats just overkill and wasteful in some ways. the power supply has a fan as well, so there's no need to worry about having so many fans in the system.computers get warm on their own, unless you're running some massive overclock and two monster graphics cards and you're gaming whenever the computer is on, its completely unnecessary. fans add to noise, no matter how silent [because of resonance and backpressure] so too many fans is a problem. the most you may want would be to have 4, one on the CPU, one on the GPU, intake, exhaust. past that, a 5th fan isn't necessary at all.
you could control them via Speedfan, or a Zalman Fanmate, or a 5.25" bay fan controller. motherboard controlling will only ramp them up when there's more heat, not necessarily load.
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A 9500GT with 1GB of RAM is the most pointless thing since NASCAR.