^^ is it possible to make dust filters? i am not aware of that. yes i will see allodum's recommendation.
just checked out the 690 II advanced. i like the case. but it does not have usb3
umm i think the advanced/plus had a usb 3.0 version..check the link below:
CM 690 II Advanced (USB 3.0 version) - Cooler Master - Leading Provider of Computer Case, Cooler, Power Supply, Laptop Cooling, Gaming Peripherals
But availability in our region can be a problem though!