I like the fan and think your placement sounds good also, although I would set both the front and the back fan to push air INTO the case and use the top to exhaust.
If you hook them to a fan control device you can balance the noise against cooling efficiency.
VB is correct about the front fan...make sure that it is not strangled by a convoluted intake path. Many cases put a fan up front and then make it difficult for them to get any air.
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