[citation][nom]blazorthon[/nom]I see no reason for this case to not be quiet just because of LEDs and even a side window.[/citation]
Blazorthon, it's not the LED fans or the side-window that really matters. What matters is the full-mesh front-panel. Most cases that have a full-mesh front-panel (and likely top-panel, too) tend to let every little noise within the case right out into the open.
As a CM-690 owner, which is a full-mesh front- and top-panel case, I can definitely attest to hearing nearly every bit of noise emitted by devices (especially fans) from inside the case. Just about any fan, and I've tried 7 different models from CM, Antec, Xigmatec, Scythe, and Enermax, that spins at or above 1200rpm can be heard, even with the case under the desk. Even the factory 1000rpm/40CFM CoolerMaster fans are audible. And any video card with a "squirrel-cage" blower on it can become downright annoying at 3000rpm or higher. Mesh rarely manages to even muffle sound - it certainly doesn't stop it.
In comparison, my Fractal Define R4 is a freakin' quiet case. Even with four 140mm fans (2x Fractal Silent Series R2's and 2x BitFenix Sceptre Pro's) cranked-up to max rpm, they can't be heard.