Ok so you want your case to be quiet. That's cool, I think it will be pretty quiet. The rest of your case is blue so I'm thinking a nice blue LED fan for the back. And don't be worried about the noise, 120mm fans move a lot of air but are much quieter than the smaller fans, so this shouldn't give you much more noise. I'm thinking you should get this sweet fan for the back of your case. Should keep your case cool and looking nice.
I have this fan, it's sweet.
Oh and nubius I don't really understand your suggestion to drop the sound card. There is a such a huge difference between an audigy 2 zs and onboard...I have no idea what you are talking about almost the same. I'm not into audio hardly at all and almost never listen to music, and I can EASILY tell the difference. Onboard I can't tell directions that good, quiet and loud sounds get blended together kinda weird, there are few features, and it can't handle advanced audio modes. With the audigy 2 zs I can easily distinguish direction in surround sound, I can hear the smallest noises and hear everything really clear, the drivers and everything are great, and it has perfect advanced EAX 4.0 where I can literally hear the echoes BOUNCING off the walls. It is the most amazing thing.
And also it runs super fast and I get higher fps and run faster in games than with onboard.
THERE IS NO COMPARISON.
for music perhaps, but for gaming and audigy 2 zs is everything, among the elite gamers onboard is absolute crap.