Cant decide between cases.

[Sadric]

So i currently have a phanteks p400,but because I cant place my h115i cpu cooler at the top,and only the front allows it.I absolutely hate it and it affects my temps.So I recently found a second hand corsair air 540[local].Which costs the same as the price when i bought the p400.However there are no dust filters at the top and bottom,only know that it provides good air cooling.But does dust filter really matter?Or where can I get dust filters for air 540 if needed.
P400 or Air 540?

 

[Sadric]

Just found another enthoo pro m with acrylic window,that costs about the same price...so there's 3 option for me now..don't change/enthoo/540