I strongly recommend A6-5400K / 6400K or A8-5600K / 6600K. Graphics integrated in A4-5300 is weak. An active cooler is recommended, e.g. Cooler Master Hyper 101 (a bit weak), Geminii M4, Ninja Mini with a 80 / 92mm PWM fan, or SivlerStone NT01-PRO with 2 x 80mm PWM fan.
The Antec Fusion is a great HTPC case. Shame the LCD display is naf, but otherwise, it's worth hanging on to. As has been suggested, a low spinning 80mm would be ok, or 120mm @ 800rpm are better. I've always rated the Noctua ones. They're silent and very reliable.
Can't quite decide on the 3.9 or 4.1ghz combo as both of them are 100w TDP. The big shuriken supposedly can handle that TDP load or can I use the mini ninja?
The mini ninja has the old pain in the butt clip retension but I thought everything went to four pin mounting on am2 and fm2 chipsets and I can't use the mini ninja on a 100w tdp cpu. its a 580g heatsink though.