Try a 38mm deep 140mm fan. Silverstone FHP141 the BEAST.http://www.overclock.net/t/1203528/official-nvidia-gpu-mod-club-aka-the-mod/3250#post_19130213
I used many different fans on the 48mm thick 120mm radiators.
The Excalibur performed well alone in push due to their high static pressure.
They are supposed to be louder than most, but:
1. I don't have to run two fans in push-pull.
2. The whoosh noise is easily tolerated.
3. I don't listen to intake noise as the intake is in the case. Why does everyone only measure intake noise?
4. Don't use these for pull. The blades will resonate. A wire ring finger guard will break up the resonance.
38mm fans seem to suffer from growling or brrrphing. I think the fan motor gets abrupt pulses that causes the blades to slap the air. Which flexes the blades and frame causing the growling. The 38mm deep fan blade steeper pitch has more sideways vector which makes the slapping effect worse.
In contrast the Noctuas PWM fans have custom motor controller that ramps up the pulses rather than the others abrupt slap on.