Admittedly, I purchased the windowless case (yeah, the $70 after rebate sold me). My PC sits below my desk anyway.
I'm definitely leaning towards the exhaust rad with fans below. As I'll have filters on everything (included the rear as an INTAKE fan), Dust should be minimal. Should also make it easier to mount.
My only concern now is if my H110 will fit! I've seen some threads saying yes and then a few posts ago in this thread, someone mentioned it won't.
I've got an NH-D14 and the H110. Whichever fits better and runs everything cooler will stay, the other gets returned to Amazon.