if you want a 8400, get this one, it have a fan, the passive one get more hot , all true the fan need some maintenance.
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the Antec is a good choice as long as you put an extra fan in front of the Hard drive, so order and extra 120mm
for your cooler you can choose this one
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or his big brother the 212+
Some report problem with the OCZ PSU... for a commercial build I use PSU not available at NCIX. can not help for other $ 50 PSU