If you want good airflow stay away from the current Corsair cases, they are all hotboxes...their least bad is the 650D. Their carbide series (400R and 500R) are coming soon and look good and are cheaper (100$/130$) maybe look at those if time permits. But for a simple case with a window/filter/high quality with good airflow I still stand by the PC-K62 (just unwire the LEDs on the fans) or if u want to spend 650D money but have basically the case with THE BEST airflow currently available...look at the Silverstone RV02 or FT02!
The problem with the Corsair cases is that they are too big in order to accommodate water cooling gear but the fans are low speed for silence...so they are too low pressure to create a noteworthy airflow, so u get hotspots under your graphics cards, around you CPU (this won't be an issue for u as u have an H50 but the GPUs will suffer).
Also note that only the fact a case has filters isn't enough to keep it dust free. If its negative pressure (more exhaust CFM than intake) even if all ur fans have filters, dust will penetrate from every single gap! that can be easily remedied tho by just putting more intake fans than exhaust on most cases! Also if you like a case but its missing dust filters, you can always
buy them apart, a 120mm one cost only 2$!
Lastly as FlyingFish pointed out, prettymuch all the Fractal cases should suite your every need except a window if you can live without one.