Today I installed two Nexus Real Silent fans in my HTPC case. The nexus fans are great, they look nice, the white blades complement the all black case, and they even come with rubber screws/ for the fan in the rear I just slipped the rubber screws through the grill, case and then fan. The rubber screws have stops that keep any part of the fan from ever touching the case, hopefully reducing noise by eliminating vibration passing. For the fan under the HDD bay I had to improvise. The fan mount in the Wesena e7 case is not a typical mount, and does not allow for the use of rubber screws. I purchased 6 1/8″ ID rubber grommets to slide over the post and isolate the fan.

Fan on rear of case (I painted the grill black)

Fan under HDD bay