SilenX fans are crap since it sacrifices airflow for noise and it barely pushes any air at all. The Noctua seems good and I've heard good things about Scythe S-FLEX. Personally I would never pay that much for a case fan and just got some Yate-Loons with a fan controller. performance-pcs.com has some decent prices on those fans.
That case already has a filter for the front fan and you don't need a filter in the back maybe block off the side vents to prevent dust. Dunno about the silicone silencers probly won't help much unless you have a really light case.
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