Let me clarify a bit further. The manual for your mobo shows it has two 4-pin SYS_FAN headers, BUT the labels on its pins (see manual p. 1-20) indicate clearly that thse really only operate in Voltage Control Mode - that is, as true 3-pin fan headers - and the 4th pin is NOT used. Such a header can control the speed of either 3-pin or 4-pin fans. Now, most 4-pin fans are more expensive, but since either type can work for you. buy the fans you want.
There's a "rule of thiumb" that you CAN connect up to 2 fans to any single mobo fan header, but not more. However, I have seen posts here that indicate more than 2 can work. Certainly 2 fans per header is quite acceptable, and this can be cone with simple Y-splitters like this one for 3-pin fans:
http://www.newegg.com/Product/Product.aspx?Item=N82E16812423168&cm_re=3-pin_fan_splitter-_-12-423-168-_-Product
That's a 6" model, but 12" ones are available; similarly, ones for 4-pin fans also are available. This splitter is designed correctly so that, of the two fans it connects to one mobo header, only one has its speed sent to the mobo, and the other is simply ignored. Using two of these, you can connect four fans to your two mobo SYS_FAN1 and 2 headers.
Your mobo also has two 3-pin SYS_FAN3 and 4 headers, BUT the labels on them indicate that they do NOT control fan speeds. They say the DC supply voltage is fixed at 12 VDC (so it cannot change a fan speed) and that Pin #3 does not even accept a fan speed signal. These two headers would be of use only for fans that you want to have run at full speed all the time, OR as power sources for some other device. For your purposes, OP, ignore them.
Of the two fans you are considering, note a significant difference between them. The Corsair LED Quiet Edition units are designed to operate more slowly to be quieter, but that means they deliver much less air flow for cooling. For example, their AF120 model (120 mm size) runs at max 1500 rpm delivering 52 CFM air flow and 25 dBA noise level. The Aerocool Shark 120 mm unit is not designed for quiet, so it runs at 1500 rpm max also, but delivers 83 CFM air flow and 26½ dBA noise level. Between those two, the Aerocool delivers much more cooling for similar noise, but it does not include LEDs. Note also that the Aerocool unit comes with a Voltage Reduction cable accessory. This little device simply slips into the fan connections and permanently reduces the fan's supply voltage, thus reducing its speed, noise, and air flow. It is useful for people who plug their fan into a fixed 12VDC supply that cannot do speed control. For you, OP, do NOT use that type of accessory because it interferes with automatic control by the mobo header.
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