Hi i have recently finished my build in a HAF 922 but i am going to get a fan controller.The aerocool touch 2000 they have good fan controllers so check out there website or i might get the nzxt sentry 2.
They work by hooking up the 4 pin molex cable from the psu to the fan controller
and then the fans hook up to the fan controller.
I cant choose a fan controller for you but the nzxt sentry is a good one but check Aerocools fan controllers as well.
Also what psu do you have?