50C idle is not normal, you shouldnt need a front fan just to keep your proc at low temps. What really are your temps at idle and load (run prime95 for load temps)Blah I dont know how to make anymore room to put fans in the front. My CPU is at 46c with this fan I found that sounds like an airplane engine its doing the job however. When I had the side case blowing air out and only 1 fan blowing air in (the front) it was at 50c idle
my CPU is a amd phenom x4 BE 940. I am using a stock heat sink.