Hi Bobkolb
The coolermaster HAFX is a great choice for a build with fantastic airflow.
I have two NVIDIA hafx cases and have set them up the following way , i am running air cooling
I have standard 230mm fan in the front
bitfenix spectro pro led fan in the rear for its high airflow and quiet noise @ 86.73CFM @ 22.8Dba but mine is at 7v for about 18Dba
I removed both front 5.25 hotswap bays and backplates and installed one of these , it has a dust filter and you can replace the fan which is what i did with a Bitfenix spectre pro 120mm led fan 56.22 CFM @ 18.9dba
this gives me great airflow direct into my cpu cooler aswell as the top portion of the installed graphics card 120mm fan , i added one more top 200 mm fan and replaced the side panel fan with a 200mm bitfenix spectre pro led fan and removed the air duct
i am running sli and have positive air pressure in my case which means less dust in my case , i also have a NZXT havik 140mm cpu cooler
hope this helps