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Unless you seal up all the mating surfaces and areas around the fans, negative or positve air pressure will be somewhat negligable. You can add too many inlet fans or inlet fans that deliver a lot of volume and create a positive or over pressurized case. The biggest restiction is in how much air you can get in thru the front area. Even when you add a front intake fan, the opening behind the fan is still the area of restriction. That's why some folks often resort to adding fans on the sides to add additonal inlet air. Best places to exhaust are up high and in the rear.
Average temps for a non-overclocked P4 would be in the upper 30 degree C range. Low to mid 40's with a slight oc. AMD's will run roughly about 5 degrees C warmer than that.
The two fans on the psu are designed to help remove some of the warm air inside the case. Lower the case temp inside helps by not forcing the psu to only have hot internal air to pass over it's components for cooling. If you put your hand behind a running psu fan, it will feel quite warm. If you move more air thru the case by increasing exhaust air and/or adding inlet volume, the psu fans will have access to cooler air also.
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